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Applications: Used to measure rotative velocity, surface speed, frequency of motor, Applicable to the product departments of motor, fan, paper-product, chemical fiber, washing-machine, automobile, airplane, steamer etc. Details: Measuring range Laser: 2.5~99.999 r / min Contact: 0.5~19.999 r / min Surface Speed: 0.05~1999.9 r / min 0.2~6560 ft / min Resolution Rotative Velocity: 0.1 r / min (0.5~999.9 r / min) 1 r / min (Over 1000 r / min) Surface Speed: 0.01 m / min (0.05~99.9 m / min) 1 m / min (Over 100 m / min) Or 0.1 ft / min (0.1~999.9 ft / min) 1 ft / min (Over 1000 ft / min) Accuracy: +/-(0.05% n +1 d) Sampling Time: 1.0 s (Over 60 r / min) Test Range Select: Automation Memory: Max / Min / Last Value Time Base: Quartz Crystal Laser Tach Detecting Distance: 50~150 mm / 2~6 inch (Typical), Max. 300 mm / 12 inch Power Consumption: 90 mA (Testing) Operating Temperaute: 0~50 C Powr Supply: 4 x 1.5 V AA size (UM-3) battery (Not included) Dimensions: 215 x 65 x 38 mm Weight: 165 g Accessories 1. Main Unit 2. Carrying Case(B01) 3. Operation Manual 4. Reflective tape 350 mm 5. Cone Adapter (AS35A) 6. Funnel Adapter (AS35B) 7. Surface speed test wheel (AS35C) * Multifunctional, one instrument combines PHOTO TACH.(RPM) & CONTACT TACH. (RPM , m / min, ft / min ). * Digital display with no guessing errors. * Wide measuring range and high resolution. * The last value / max. value / min. value will be automatically stored in memory. * The use of durable, long-lasting components, including a strong, light weight ABS-plastic housing assures elegant shape and ease of use. Item Weight 2.2 pounds Manufacturer VETUS INSTRUMENTS Package Dimensions 5.91 x 3.94 x 3.15 inches Is Discontinued By Manufacturer No