Usage Tips:Accurate Tachometer: This handheld tachometer is very precise and non-contact. With a wide measurement range from 2.5 RPM to 99999 RPM and a high resolution of 0.1 RPM or 1 RPM, this rpm meter can give you accurate tachometer readings from a distance. Multifunction Tachometer: This handheld tachometer automatically records maximum, minimum and last values, plus the digital counter features features like auto-ranging and low battery indication. Large 5-Digit LCD Display: This digital speedometer measures speed in revolutions per minute. Information is displayed on a large, easy-to-read LCD display. Sampling time: 0.8 seconds (above 60 RPM) Effective measuring distance: 50mm~500mm Time base: 6MHz quartz crystal oscillator Range selection: automatic switching Power supply: single 6F22 9V battery (not included) Power consumption: about 35mA Material:Metal + Plastic colour:black Package Contents: 1 * Tachometer 1 * PU leather cover 3 * Test paper (12mm x 205mm) 1 * English manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.