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HT4200 Digital Handheld Non-Contact Tachometer High Accuracy Non-Contact Tachometer 4 to 50,000 RPM Range Accurate to ±1 RPM, at low velocities Measures RPM from a distance of 20 to 300mm Memory Recall, up to 10 points Powered by 3-AAA batteries 5-digit LCD display The HT4200 is a compact, non-contact type hand held digital tachometer. Affix one of the reflective marks to the rotating surface of the target measurement object, and then aim the red visible light at the mark. If multiple marks are affixed to the target, measurements as low as 4 rpm may be made. Comes complete with 1 sheet (25 marks) of reflective stickers, 3-AAA batteries and user's manual.