Laser Tachometer Digital Display Measuring Speed Meter 1. Measuring range: non-contact: 3-100000RPM; contact: 3-19999RPM, 0-99999m, 0-1999.9mmin, 0-9999.9ftmin 2. Accuracy: non-contact: 0.05%FS+1RPM; contact: 0.1%FS+1RPM 3. Speed display: 6-digit display, up to 99999 4. Measuring distance: 50-500mm 5. Measuring method: TA500A: non-contact; TA500C: non-contactcontact. 6. Sampling time: 0.8 seconds (above 60 rpm) 7. Operating environment: -10 - 50 degrees Celsius, 80% relative humidity or less, indoor altitude of less than 2000m 8. Storage environment: -10 - 50 degrees Celsius, within 70% relative humidity (remove batteries) 9. Power supply: 2 x 1.5V AAA (R03LR03) batteries (not included) 10. Display size: about 3.4 x 3.1cm 11. Dimensions: TA500A: about 13 x 5.9 x 2.9cm; TA500C: about 14.6 x 5.9 x 2.9cm 12. Weight: TA500A: about 110g; TA500C: about 120g Features: 1. Semiconductor laser sensor 2. Can lock the maximum value, minimum value and real-time value during the measuring process 3. Large HD display with white background lighting 4. 15 minutes without operation after the automatic shutdown (can be canceled manually) Packing list: - Main unit x 1 - Reflective paper x 2 - Instruction manual x 1