Features: [Compact Size] Easy to carry, convenient to operate and durable to use. [LCD Display] 5-digit LCD clear display with backlight, 99999 maximum reading, not dazzling in grey font, visible in low luminance environment. [Non-contact Measurement] Based on embedded MCU, optoelectronic technology and semiconductor laser technology, this tachometer realizes accurate non-contact measurement.? [Switchable Measurement Modes] Manual / Automatic mode optional, meeting various requirements. [Adjustable Laser Gear] Adjustable laser power (high / low), adapting the far / near distance requirement to protect user' s eyes. [Automatic Record] Automatically recording 50 sets of data, and the sampling interval time could be reset to meet different needs.? [Automatic Shutdown] Automatic shutdown in 30 seconds without operation. [Additional Features] Capable of recording the maximum, minimum and average values. Specifications: Material: ABS Color: Grey Power Supply: 2 * AAA battery (NOT included) Power Consumption: 25mA (laser in low power), 40mA (laser in high power) Operating Temperature: 0~50 celsius Storage Temperature: -20~60 celsius Display: 5-digit LCD, Max. 99999 Available Distance: 50mm~500mm Sample Time: 0.5s (over 120RPM) Measuring Range: 2.5RPM~99999RPM Resolution: 0.1RPM (2.5RPM~999.9RPM), 1RPM (1000RPM~99999RPM) Accuracy: +/-0.05%rdg + 1digtal Item Size: Approx. 11*6*2.5cm / 4.33*2.36*0.98in Item Weight: Approx. 72g / 2.54oz Package Size: Approx. 19.3*12.5*4.5cm / 7.6*4.92*1.77in Package Weight: Approx. 143g / 5.04oz Note: Please read the Users Manual before use. Packing List: 1 * Digital Tachometer 3 * Reflecting Tape Mark 1 * Users Manual(English)