Digital Tachometer TA500 Series for measuring rotational speed, surface speed, and distance. Ideal for electric power, steel, petrochemical, aviation, fan manufacturing, ventilation systems, underground garages, and more. **Specifications:** Model: TA500A, TA500B, TA500C (Optional) Measurement Methods: Non-contact/Contact/Non-contact & Contact (Optional) Material: ABS Range: TA500A: Non-contact: 3 to 100,000 RPM TA500B: Contact: 3 to 19,999 RPM, 0 to 99,999 m, 0 to 1,999.9 m/min, 0 to 9,999.9 ft/min TA500C: Non-contact: 3 ~ 100,000 RPM Contact: 3 ~ 19,999 RPM, 0 ~ 99,999 m, 0 ~ 1999.9 m/min, 0 ~ 9999.9 ft/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: ± (0.05%FS+1RPM) Contact: ± (0.1%fs+1rpm) Resolution: TA500A: RPM: ＜ 10000 ： 0.1, RPM: ≥10000: 1 TA500B & 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: 50 mm ~ 500 mm Sampling Rate: 0.8 s (over 60 RPM) Operating Environment: -10 ~ 50 ℃, max 80 % RH, indoor altitude: 2,000 m Storage Environment: -10 ~ 50 ℃, max 70 % RH (battery removed) Power Supply: 2 x 1.5 V AAA (R03/LR03) (Not Included) Item Size: 130 * 59 * 29 mm/5.12 * 2.32 * 1.14 inches Item Weight: 110 g/3.88 oz Package Weight: 162 g/5.71 Oz Package Size: 20 * 7.5 * 4 cm/7.87 * 2.95 * 1.57 inches **Package List:** 1 * Digital Tachometer 2 * Reflective Tape 1 * Manual (English)