Used Byk Gardner Spectro Guide for sale (4,737)

Condition: good (used), Gardner Denver Vacuum Pump S-VSI 100 Dry-running, non-contacting screw vacuum pumps Simple maintenance. Suitable for industrial applications such as vacuum forming, metallurgy, and surface engineering. High efficiency due to stepped screw profile. Technical data: Suction capacity m3/h max. 100 at 50 Hz // 138 at 60 Hz Final pressure mbar (abs.) 0.1 Rated voltage 50 Hz/60 Hz: 230/400V ± 10% / 220/380V Motor power 50 Hz/60 Hz: 3 / 3.6 kW Current draw 50 Hz/60 Hz: 10.5 / 6.0 Speed rpm 50 Hz/60 Hz: 2880 / 3550 Weight: 190 kg Cooling water consumption: 1.8 l/min Operating hours: Between 321 - 14613 h Approximately 80% of the pumps have less than 4,000 operating hours. Since we have approximately 40 of these pumps, we will ship them randomly. 1x Gardner Denver Vacuum Pump S-VSI 100 You can find more items - new and used - in our shop! International shipping costs available upon request! Gsdsk Sgvcspfx Ag Souh

Condition: like new (used), Year of construction: 2022, 5 x ABB / Asti EBOT 1000 Automated Guided Vehicles, Unused (2022) Guodpfxsz Nkycs Ag Sjh Omnidirectional automated guided vehicle (AGV), designed for heavy-duty industrial logistics Maximum payload capacity of 1,000kg Battery: Li-Ion 48v, 40 Ah Charging System: Online charging system via contact brushes Speeds: Unloaded 2 M/S, Loaded 1.5 M/S, sideways driving 0.6 M/S, Tunneling 0.3 M/S

Condition: used, Year of construction: 2007, Gardner Denver VLT 40 oil-free vacuum pump, 150 mbar, 1.5 kW Manufacture: Gardner Denver Type: VLT 40 (01) Year of manufacture: 2007 Total: 1.5 kW Speed: 1420 r/min Weight: 52 kg Air delivery: 42/50 m3/h Max vacuum: 150 mbar Guedpfx Aeufiq Ejg Ssh IP55

Condition: excellent (used), Year of construction: 2021, - Manufacturer: THULL - Type of equipment: Robotic cell for depalletizing cans - Intended use: Metal cans - Can dimensions (Ø × H): 90 × 82 mm / 90 × 92 mm - Output: 300 cans/min (18,000 cans/hour) - Number of robots: 2 - Robot 1: YASKAWA YR-1-06VXL35-A00 - Number of axes of robot 1: 4 - Payload of robot 1: 35 kg - Robot 2: YASKAWA YR-1-041 XH190-A00 - Number of axes of robot 2: 6 - Payload of robot 2: 190 kg - Year of robot production: 2021 Gjdpfx Agez Snyfs Ssuh - Gripping system: Layer gripper and slip sheet gripper - Empty pallet magazine: 15 pallets - Magazine load capacity: 500 kg - Vacuum pump: GARDNER DENVER G-BH2 - Conveyor system: Belt and chain conveyors - Output system for cans: From 5 lanes to 1 lane - Safety features: Protective enclosure and safety light barriers

Condition: used, Used Babcock Gardner Type 100L 316 stainless steel ribbon blender. Approximate 100 litre working capacity. Mixing trough approximately 350mm wide x 500mm deep x 1000mm long. Single interrupted ribbon direct driven by a 1.5 kw 415 volt 3/50 1420 rpm motor through a David Brown GHT 2 gearbox with a ratio of 20.34/1 and an output RPM of 71.3. Guodpfozfh U Dex Ag Seh Specifications: Capacity: 100 L Construction Material: Stainless Steel Horsepower: 1.5 kW Jacket: No

Condition: good (used), Year of construction: 2000, Weber Assembly Table / Joining Station Guedozni Rxopfx Ag Soh Heavy-duty industrial assembly table / joining station from the quality manufacturer WEBER Konstruktion Maschinenbau GmbH. This machine is characterized by an extremely robust mechanical basic structure and is ideal for production facilities, workshops, or as a perfect foundation for a modernization project. Technical data (according to the nameplate): Manufacturer: WEBER Konstruktion Maschinenbau GmbH (Aschaffenburg) Type: Assembly table Machine No.: BA 659 00 Year of manufacture: Electrical connection: 380 V (CEE plug available) Pneumatic connection: 6 bar "Everything from a single source: We will gladly offer you suitable financing for your project." You can find more items – new and used – in our shop! International shipping costs available upon request!

Condition: used, Bruker Type: Tensor 27 IR Spectrometer Maximum sample flexibility. Thanks to the improved QuickLock™ mechanism and the locking button on the front, even bulky accessories can be quickly and, above all, safely installed. In addition, the INVENIO can be equipped with three software-controlled beam outputs for a wide range of external modules. FPA micro and macro imaging Variable external sample chamber (left and right) for individual experiments Fiber optic coupling to fiber probes for liquids and solids Integrating sphere Autosampler for liquids High-throughput analysis module HTS-XT Reflection unit for the air-water interface And much more! Gujdpfszh D Nvjx Ag Seh Condition: used Scope of delivery: (See image) (Changes and errors in the technical data are subject to change!) We would be happy to answer any further questions you may have over the phone.

Condition: used, Year of construction: 2023, Standard observers: 2° (1931) and 10° (1964), standard illuminants: D65, D55, F11, A, C, color spaces/values: XYZ, Yxy, LCh*, Luv*, ΔE CIE Lab*, ΔE CIE94, ΔL*, Δa*, Δb*, yellowness index according to DIN 6167 or whiteness metrics, spectral range: 400-700nm, spectral resolution: 10nm (internally 3.5nm), spectrometer: holographic grating spectrometer, display: relative values, absolute values or customer-specific values, repeatability: ΔE = 0.05 CIE Lab, repeatability test: 10 measurements of the supplied white standard, memory: non-volatile, more than 1,500 measurements without a PC, ambient temperature: 15-35°C, max. relative humidity: 85%, non-condensing, PC interfaces: USB, RS232, current output: 4-20mA, length: 235mm, width: 220mm, height: 60mm, weight: 1.85kg, including original operating manual, USB flash drive with installation file for "ColorDaTra_IPM" software version 1.94, installation file for update to version 1.95 and license key, last calibrated in 2025. On-site inspection is possible. Gedpfoz R Uwpjx Ag Souh

Condition: ready for operation (used), Year of construction: 2000, functionality: fully functional, travel distance X-axis: 1,100 mm, travel distance Y-axis: 500 mm, travel distance Z-axis: 640 mm, controller model: SIEMENS 840 D, spindle speed (max.): 10,000 rpm, TECHNICAL DETAILS Travel range, X-axis: 1,100 mm Travel range, Y-axis: 500 mm Travel range, Z-axis: 640 mm Number of pallets: 2 Table size: 2 × 1,000 × 450 mm Table load capacity: 600 kg Spindle speed range: 50–10,000 rpm Drive power: 18.5 kW Tool interface: DIN 69871 / ISO 40 Feed rate range X/Y/Z: up to 10,000 mm/min Rapid traverse rate in all axes: 30 m/min MACHINE DETAILS CNC path control: SIEMENS 840 D Number of tool positions: 30 Machine dimensions & weight Machine dimensions L × W × H: approx. 3,605 × 3,041 × 3,220 mm Machine weight: approx. 6,700 kg EQUIPMENT 2-position pallet changer 30-position tool changer Internal coolant supply (ICS) Full enclosure with electrically interlocked safety doors Guodpsz Ibb Tefx Ag Ssh Linear guides with double roller recirculating bearing for even absorption of high torques in all directions Ball screws in all 3 axes Machine bed made of Meehanite cast iron for high precision, rigidity, and vibration damping Swivel chip conveyor with integrated coolant system Preparation for 4th axis CE compliant

Condition: used, DÜRR DÜRR testing station for adhesive applicators DÜRR testing station for adhesive applicators, including (5 robot-controlled adhesive applicators) DÜRR testing station (DÜRR in-house design) for the automotive industry Weight: 1200 kg Type: DÜRR testing station for adhesive applicators Condition: used Scope of delivery: (See image) (Subject to change and errors in technical data; information provided is without guarantee!) We will gladly answer any further questions you may have over the phone. Gusdpfez Nflyex Ag Ssh

Condition: used, Automation Assistant Oy Linear Guided Free Fall Tester Gjdpfx Ajzn Uqdsg Sjuh Automation Assistant Oy LG2750 Professional linear guided free fall test stand for reproducible drop and impact tests For sale is a used Linear Guided Free Fall Tester from the manufacturer Automation Assistant Oy. The test stand is suitable for reproducible drop and impact tests in research, development, quality assurance, and industry. Operating manual and electrical documentation are available. Technical data: Manufacturer: Automation Assistant Oy Type: LG2750 Machine type: Linear Guided Free Fall Tester Made in Finland Power supply: 230 V AC / 50 Hz Max. current consumption: 10 A Control voltage: 24 V DC / 2.5 A Pneumatic supply: max. 8 bar Impact material: Concrete garden brick 300 × 300 × 50 mm Dimensions (approx.): Width: 850 mm, Depth: 900 mm, Height: 2750 mm Total weight: approx. 210 kg Test tower: approx. 155 kg Impact table: approx. 55 kg Equipment: Touchscreen control panel Enclosed safety cabinet with protective glazing Linear guided drop sled Pneumatic gripper SMC pneumatic components Emergency stop system Impact table with concrete impact plate Electrical documentation available Accessories as shown in the pictures Application areas: Drop tests Impact tests Product testing Quality assurance Research and development Laboratory and industrial applications Scope of delivery: Automation Assistant Oy LG2750 Linear Guided Free Fall Tester Operating manual Electrical documentation Accessories as shown in the pictures Condition: Used Visual condition as shown in the pictures. Normal signs of wear and tear due to age. Shipping by freight forwarder is possible. Subject to changes, errors and prior sale. We will gladly answer any further questions by telephone.

Condition: ready for operation (used), Year of construction: 2004, Centerless grinding machine manufactured in 2004. This HERMINGHAUSEN SR 2 W features a grinding wheel circumferential speed of 35 m/sec and is equipped with a Lenord+Bauer control panel with a digital display. It includes a coolant and filtration tank system, along with a part feed chute/guide. If you are looking to get high-quality grinding capabilities, consider the HERMINGHAUSEN SR 2 W machine we have for sale. Contact us for further details. Godpfx Aoz Sp Ukjg Sjuh - Grinding Wheel Circumferential Speed: SUG=35m/sek.- Voltage / Current / Frequency: 400V / N / PE / 50 Hz- Rated Current: 25 A- Control / Panel: Lenord+Bauer control panel with digital display / SFS upgrade- Equipment: Coolant / filtration tank system, part feed chute/guide

Condition: good (used), Year of construction: 2004, functionality: fully functional, cutting height (max.): 260 mm, control type: NC control, overall weight: 1,100 kg, Equipment: lighting, Band saw machine Manufacturer: Meba Type: Meba Profiline 260-AP Year of manufacture: 2004 Control system: Meba Serial number: XXXX Gedpfx Aez Hbgasg Ssuh Technical data: ----- - Cutting range 90° round: 260 mm - Cutting range 90° rectangular: 300 x 260 mm - Cutting speed: 15 - 150 m/min (AC drive) - Drive, saw band: 1.5 kW - Scrap length, automatic: 90 mm - Scrap length, manual: 10 mm - Cutting pressure: infinitely variable / electric - Saw frame guided twice via linear guides - Material feed via controlled feed clamp ..with hydraulic material full-stroke clamping - Saw band dimensions: 3,350 x 27 x 0.9 mm - Machine weight: approx. 1,100 kg Accessories: ----- - 5x saw band, new

Condition: ready for operation (used), Year of construction: 2016, machine/vehicle number: 306533, functionality: fully functional, cutting height (max.): 350 mm, cutting width (max.): 610 mm, overall weight: 550 kg, saw band length: 4,700 mm, TECHNICAL DETAILS Saw band length: 4,700 mm Tool dimensions: 13 × 0.65 × 24 TPI Guide roller diameter: 630 mm Cutting height: 350 mm Cutting width without rip fence: approx. 610 mm Cutting width with rip fence: 150 mm Loading height: 1,065 mm Cutting speed: 10–100 m/min Table travel: approx. 600 mm Table feed rate: 0.03–0.3 m/min MACHINE DETAILS Dust extraction connection diameter: 1 × Ø 120 mm + 1 × Ø 100 mm Required flow velocity: min. 25 m/s Required volume flow: 1,725 m³/h Operating voltage: 400 V / 50 Hz Type of current: 3 × 400 V Fuse rating: max. 16 A Gsdpfxez Im Ske Ag Sjuh Minimum conductor cross-section: 1.5 mm² Motor power: 0.75 kW Dimensions & Weight Dimensions (L x W x H): approx. 1,850 x 1,200 x 2,300 mm Machine weight: approx. 550 kg

Condition: excellent (used), Year of construction: 2019, volume flow: 0.97 m³/h, operating pressure: 10 bar, pressure: 10 bar, GARDNER DENVER CHAMPION FM 07 screw compressor Motor 7.5 kW Capacity 0.97 m3/min Gsdpfxow D S Rce Ag Ssuh Pressure 10 bar Year of manufacture 2019 Compressor is fully operational.

Condition: good (used), functionality: fully functional, Year of construction: 2021, 3 units of driverless transport systems, SAFELOG. AGV M4 – used: Price per unit: €12,500.00 (net)! Manufacturer: SAFELOG GmbH Type: AGV M4 Year of manufacture: 2021 Includes inductive charging station and wireless station Manufacturer data: Forward and reverse travel possible Wear-free charging during the process using an inductive charging system Scalable battery capacity with LiFePo4 batteries to adapt to process requirements Flat design with only 220 mm height – ideal for driving under 7” touch display for easy operation Agent-based control for communication between AGVs and their environment Electric lifting pin for automatic pickup and release of trailers up to 1.5 t Travel speeds from 0.02 m/s to 1.6 m/s Hybrid navigation consisting of magnetic track, contour navigation, camera navigation, and odometry Safety laser scanner in each direction of travel Technical data Designation SAFELOG AGV M4 Article number 106148 Electrical data Operating voltage AGV [V] 24 DC Charging time with inductive charging system (with 1 / 2 / 3 / 4 batteries) [min] 30 / 40 / 60 / 80 * Capacity (with 1 / 2 / 3 / 4 batteries) [Ah] 21 / 42 / 63 / 84 Operation Temperature operating range [°C] 5 - 35 Positioning accuracy [mm] + / - 5 * Min. turning radius [m] 1 Gedpfx Agozpf Rwo Seuh Maximum speed (with trailer/without trailer) [m/s] 1.0 * / 1.6 * Continuous operating time without load (with 1 / 2 / 3 / 4 batteries) [h] 4 / 8 / 12 / 16 * Mechanical data Housing material Steel Dimensions (L / W / H) [mm] 1460 / 450 / 220 Weight AGV [kg] 235 Max. payload AGV (top load) [kg] 200 * Max. towing weight (trailer) [kg] 1500 * Condition: good Available: immediately Location: Erfurt area, later warehouse Frankenberg / Saxony

Condition: used, Shimadzu Type: Prestige-21 / with AIM-8800 infrared microscope Shimadzu IR Prestige-21 infrared spectrophotometer The IRPrestige-21 is designed for both highly sensitive and broad applications in the fields of research and development. It thus provides an excellent addition to the existing FTIR series, which covers, among other things, the standard laboratory area. AIM-8800 specifications Optics: 15x Cassegrain objective 15x Cassegrain condenser mirror with inlet for purging MCT detector: with liquid nitrogen monitoring system Wavelength range: Type 1 - 5000 - 720 cm-1 Type 2 - 5000 - 650 cm-1 Electrically activated aperture XYΘ directional drive. The adjustment of the XY directional increments is 1 µm above the sample surface and 1° steps in the Θ direction (numerical input possible). Minimum adjustment value: 3 µm Motor-driven XY sample stage Positioning range: X-axis: 70 mm; Y-axis: 30 mm Resolution: 1 µm distance Sample thickness: Reflection mode - ≤ 40 mm Transmission mode - ≤ 10 mm Operation via the keyboard of the main unit Selection of the measurement mode / XY stage operation (speed control in 4 steps) / manual focusing / illumination control (Optional) Control via PC Selection of the measurement mode / XY stage operation / automatic centering / manual focusing / automatic focusing / illumination control / Guodpfozdyyiex Ag Seh Aperture adjustment / aperture preview / measurement position and recording of the aperture setting (10 sample positions, 2 background positions) Environmental conditions: Ambient temperature: 15°C ~ 30°C Humidity: 70% or less External dimensions, weight: W410mm x D540 mm x H520 mm x 36kg Condition: used Scope of supply: (See picture) (Changes and errors in technical data are subject to change!) We will be happy to answer any further questions you may have by telephone.

Condition: excellent (used), For sale: Constantin Hang 162.01 electric riveting/eyeleting machine from a reputable German manufacturer. This machine is designed for making riveted joints and installing eyelets in paper, cardboard, leather, fabrics, tarpaulins, and other materials. Its robust construction and precise head ensure high accuracy and repeatability. Technical specifications: * Manufacturer: Constantin Hang Maschinenfabrik * Model: 162.01 * Serial number: 40 031 * Country of origin: Germany * Type: electric riveting/eyeleting machine * Control: foot pedal * Drive: electric * Large work table with guides * Stable construction * Working head marked: 24/4 × 6–8 * Working reach: approx. 620 mm Applications: * Installation of metal eyelets, * riveting of components, * production of binders and folders, * bookbinding, * leather goods, * textiles, * banners and tarpaulins (with appropriate tooling), * production of technical components. Condition: Guedpsz Sm Trjfx Ag Sjh * Used. * Functional. * Shows normal signs of use, as visible in the photos. * Sold in the exact condition as shown in the photographs.

Condition: excellent (used), For sale: a professional, two-spindle eyeletting/riveting machine, Constantin Hang Typ 150 3P, manufactured in Germany in 1983. This machine is designed for the simultaneous installation of two eyelets or rivets, significantly increasing work efficiency. The machine is used in bookbinding facilities, printing companies, and factories producing binders, folders, calendars, tags, and other paper products. It is equipped with two working units, an adjustable table, and precise guides that allow for accurate material positioning. Technical specifications: Manufacturer: Constantin Hang Maschinenfabrik Model: Typ 150 3P Year of manufacture: 1983 Serial number: 35805 Country of manufacture: Germany Type: two-spindle eyeletting/riveting machine Two working heads Adjustable work table Guides and material position adjustment Guedpfjz Sm Urjx Ag Soh Robust industrial construction Electric drive Condition: used Applications: eyelet installation, riveting, binder production, folder production, calendars, promotional tags, cardboard packaging, bookbinding and printing. The machine is sold in the condition shown in the photos.

Year of construction: 2004, operating hours: 5,000 h, condition: good (used), functionality: fully functional, machine/vehicle number: 2917, Thermo Scientific ARL 3460 Spectrometer Thermo Scientific ARL 3460 optical emission spectrometer (OES) for sale. This unit was previously used in a foundry and was operational until it was replaced. The equipment is designed for rapid chemical analysis of metallic materials and was used in foundries and the metallurgical industry for quality control and composition verification. Features: • Brand: Thermo Scientific • Model: ARL 3460 • Equipment type: Optical emission spectrometer (Spark OES) • Year of commissioning: 2004 • Condition: operational until replacement • Origin: foundry / metallic material analysis • Maintenance: Annual maintenance inspections • Applications: quality control and chemical analysis of metals • Analytical capability: simultaneous analysis of multiple elements, depending on the line/installed configuration, including C, Mn, Si, P, S, Ni, Cr, Mo, N, Cu, W, Nb, V, Co, Al, Ti, and Fe • Common materials: iron, carbon steels, stainless steels, super duplex steels, nickel-based alloys, and other metallic alloys • Includes: PC, monitor, spare parts, and commonly used consumables available with the equipment • Reason for sale: equipment upgrade Gusdpfxjzdzgqs Ag Seh Additional information, photographs, and sales terms can be provided to interested parties.

Condition: refurbished (used), Year of construction: 2022, functionality: fully functional, cutting height (max.): 155 mm, cutting width (max.): 1,250 mm, saw blade diameter: 450 mm, cutting length (max.): 3,450 mm, The machine has been completely overhauled by the manufacturer! TECHNICAL DETAILS Sawing unit Cutting height: max. 155 mm Cutting height at 45°: max. 105 mm Saw blade diameter: max. 450 mm Saw blade arbor: 30 mm Swivel range: 0–46° Guodpfx Ajz Irygog Sjh Motor power: 5.5 kW Speed: 3,000 / 4,000 / 5,000 / 6,000 rpm Cutting range Cutting width: 1,250 mm Cutting length: 3,450 mm Sliding table length: 3,200 mm Cross slide and stops Digital folding stops: 3 Cross slide extendable up to: 3,500 mm Positioning accuracy parallel stop: 0.1 mm EQUIPMENT Scoring unit Auto-EPS with electromechanical side and height adjustment Electrically controlled parallel stop Electrically controlled axis adjustment Cross slide with 3 digital folding stops Machine completely overhauled by the manufacturer Sliding table completely re-adjusted Linear guide rail converted to a new digital system with 3 stops Stainless steel scale for angle adjustment renewed Cross slide checked 90° locking of the fence completely renewed Electrical system checked Machine re-adjusted, checked, and lubricated German-language documentation

Condition: excellent (used), For sale: Constantin Hang 103 LOK die-cutting machine, a product from a renowned German manufacturer. This device is designed for the precise die-cutting of paper, cardboard, leather, felt, rubber, and other soft materials. The machine is equipped with an electric drive, foot pedal control, and a robust work table with a material guide, ensuring comfortable and precise operation. Thanks to its robust construction, the device is characterized by high durability and reliability. Technical specifications: Manufacturer: Constantin Hang Maschinenfabrik Model: 103 LOK Machine number (Serial no.): 9578 Type: die-cutting machine Drive: electric Godoz Sm T Sspfx Ag Ssuh Control: foot pedal Motor: Georgii KRD 328 Power supply: 220/380 V Motor power: 240 W Frequency: 50 Hz Motor speed: 680 rpm Work table with guide Robust steel construction Condition: Used. Functional. Shows normal signs of wear and tear due to age and use. Visual condition consistent with the photos.

Condition: used, functionality: unexamined, machine/vehicle number: G-BH7, Used Gardner Denver G-BH7 Vacuum Blower Manufacturer: Gardner Denver / Elmo Rietschle Model: G-BH7 2BH7320-OAH56 Guodpfxew H Rgbo Ag Soh Side channel blower / Vacuum blower / Vacuum compressor Power: 50/60 Hz, 1.5 kW, 200/240/345/415 volt Capacity: 2850/min | 3460/min

Condition: excellent (used), For sale: a glue roller from Karl Tränklein, a renowned German manufacturer of bookbinding machines. This device is designed for the precise and uniform application of glue to paper, cardboard, corrugated board, veneer, and other flat materials. The machine is equipped with an electric drive, a metal working roller, and adjustable glue application settings, allowing the operating parameters to be adapted to the type of material being processed. Its robust, heavy-duty construction ensures stability and long-term durability. Technical specifications: Manufacturer: Karl Tränklein Country of origin: Germany Gjdpfx Agsz Snaho Sjuh Type: glue roller / applicator Drive: electric Power supply: 400 V Adjustable glue application Metal working roller Work table with guides Drip tray for excess glue Heavy-duty, robust construction Applications: bookbinding, printing, packaging production, gluing paper, cardboard, and corrugated board, applying glue to veneer and other flat materials. Condition: used, fully functional. It shows normal signs of wear and tear from use. The visual condition and completeness are consistent with the photos.

Condition: used, Year of construction: 2026, Slitting line 1500 x 6, made by GUIDA Line composition: - Loading coil car - Uncoiler with sliding base and single expanding mandrel - Pressure arm - Feeding telescopic table with cutting edge and deflecting roll - Entry pinch roll - Crop shear - Tilting table - Mechanical centering device - Calming rolls - Slitting shear - Looping pit equipment (entry and exit saddles + connecting tables) - Felt press - Deflecting rolls - Titling table - Recoiler with single expanding mandrel - Separator arm - Electric equipment - Hydraulic equipment - Safety fences protection - Several tooling and accessories - Spare parts Material to be processed: Hot rolled carbon steel Material tensile strength: 400 N/mm² Guodpfx Asymciajg Seh Coil width max.: 1.500 mm Thickness: 1 - 8 mm Coil weight: 20 Tn Coil inside diameter entry: 500/600 601 + steel spacers for bigger diameter Coil external diameter Entry/Exit: 1.700 mm Slitting shear mandrels diam.: 220 mm Blades diameter: 355 mm Line speed: 50/25 m/min with manual speed change gear Working Direction: From left to right Power supply tension: 380/50 Hz