Portable Measuring Speed Meter Digital Display Laser Tachometer 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: 5-digit display, up to 99999 4. Effective measurement 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, relative humidity within 80%, indoor altitude less than 2000m 8. Storage environment: -10 - 50 degrees Celsius, relative humidity within 70% (remove the battery) 9. Power supply: 3 x 1.5V AA (R03LR03)Micro USB interface 5V (without battery) 10. Display screen size: about 53 x 44mm 11. Dimensions: Contact type: about 200 x 70 x 35mm Non-contact type: about 185 x 70 x 35mm 12. Weight: Contact type: about 200g Non-contact type: about 190g Features: 1. Semiconductor laser sensor, effective measurement distance 50mm-500mm 2. The upper and lower limit alarm thresholds can be set. When the measurement is higher or lower than the set threshold, the instrument will sound a prompt and the panel indicator light will light up 3. High-definition color large screen display, display screen with background light 4. Dual power supply mode, automatic shutdown after 15 minutes of no operation (can be manually canceled) 5. TA503C dual-use supports USB connection to computer, with real-time data communication with computer, displaying real-time data table and real-time data curve graph