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 parallax.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 1mWDisplay: 5-digit 18mm (0.7inch) LCD screenAccuracy: (0.05%+1) expressed as (% of reading + least significant digit)Sampling time: 0.8 secondsRange selection: automatic switchingTime base: 4MHz quartz crystal oscillatorEffective distance: 50mm~500mmDimensions: about 131mm x 70mm x 29mm/5.16x2.76x1.14inPower 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:greyMaterial:plasticPackage 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.