Convenient to Use: The digital tachometer features the streamlined appearance, which is convenient and comfortable use. Accurate Measurements: The digital tachometer features microcomputer technology, anti-interference technology and many other advanced technologies, it can accurately measure the speed value. LCD Display: Wide measurement range and high resolution. Large-screen LCD display, clear reading, no . Smart Tach: When the battery voltage is lower than the specified value, it will automatically give you a reminder. Durable Meter: Exquisite structure, strong and durable. Infrared class: class 2 (IEC/EN60825-1/2007) Output power Less than 1mW Display: 5-digit 18mm (0.7inch) LCD screen Accuracy: (0.05%+1) expressed as (% of reading + least significant digit) Sampling time: 0.8 seconds Range selection: automatic switching Time base: 4MHz quartz crystal oscillator Effective distance: 50mm~500mm Dimensions: about 131mm x 70mm x 29mm/5.16x2.76x1.14in Power supply: 6F22 9V battery (without battery) Test range: 2.5~99999rpm (revolution/min) Operating temperature range: 0~50Celsius (32~122Fahrenheit) Resolution: 0.1rpm (revolution/min) (2.5~999.99rpm) 1rpm (revolution/min) (above 1000rpm) Colour:grey Material:plastic Package Contents: 1 x Tachometer(without battery) 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.