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TASI Non-contact Portable Measuring Speed Meter Digital Display Laser Tachometer end of line heels these sunglasses mens womens are1. Measuring range: Non contact: 3 100000RPM Contact: 3 19999RPM, 0 99999m, 0 1999. 9m min, 0 9999. 9ft min 2. Accuracy: Non contact: 0. 05%FS+1RPM Contact: 0. 1%FS+1RPM 3. Speed ?? display: 5 digit display, up to 99999 4. Effective measurement distance: 50 500mm 5. Measuring method: TA500A: non contact; TA500C: non contact contact 6. Sampling time: 0. 8 seconds (above 60 rpm) 7. Operating environment: 10 50 degrees Celsius, relative humidity within