TA500 series digital tachometer that can measure the RPM or surface speed and distance. It is applicable to electric power, steel, petrochemical, aviation, fan manufacturing, pipeline ventilation system, underground warehouse and other occasions. Specifications: Model: TA500A, TA500B, TA500C (Optional) Measurement Methods: Non-contact / Contact / Non-contact and Contact (Optional) Material: ABS Range: TA500A: Non-contact: 3~100000RPM TA500B: Contact: 3~19999RPM, 0~99999m, 0~1999.9m/min, 0~9999.9ft/min TA500C: Non-contact Type: 3~100000RPM Contact Type: 3~19999RPM, 0~99999m, 0~1999.9m/min, 0~9999.9ft/min Accuracy: TA500A: (0.05%FS+1RPM) TA500B: (0.1%FS+1RPM), (0.1%FS+0.2m), (0.1%FS+0.2m/min), (0.1%FS+0.6ft/min) TA500C: Non-contact Type: (0.05%FS+1RPM) Contact Type: (0.1%FS+1RPM) Resolution: TA500A: RPM: ＜10000：0.1, RPM: 10000:1 TA500B and TA500C: RPM: ＜10000：0.1, RPM: 10000:1, m: ＜10000 : 0.1, m: 10000 : 1, m/min: ＜200 : 0.1, ft/min: ＜1000 : 0.1 Display: 6 digits, max 99999 Effective Measuring Distance: 50mm~500mm Sampling Time: 0.8s (above 60 rpm) Working Enviroment: -10~50,max 80%RH, indoor altitude＜2000m Storage Enviroment: -10~50,max 70%RH (battery removed) Power: 2 x 1.5V AAA (R03 / LR03) (Not included) Item Size: 130 * 59 * 29mm / 5.12 * 2.32 * 1.14in Item Weight: 110g / 3.88oz Package Weight: 162g / 5.71oz Package Size: 20 * 7.5 * 4cm / 7.87 * 2.95 * 1.57in Package List: 1 * Digital Tachometer 2 * Reflective Tape 1 * User Manual (English)