Extech RPM40 （接触/非接触）激光光电式转速计

Specifications: 
Range (rpm):
-  Photo mode:  5 to 99,999 rpm
- Contact mode: 0.5 to 19,999 rpm
Surface Speed : 2.0 to 78,740 inches/min ; 0.2 to 6560 ft/min; 0.05 to 1999.9 m/min
Accuracy : 
- Photo mode: ±(0.1% rdg +1 digit)
- Contact mode: ±(0.1% rdg +1 digit)
Sampling Time: 
- Photo mode: 1 s (> 60 rpm)
- Contact mode: 1 s (> 60 rpm)
Resolution: 0.1rpm (< 1000 rpm); 1rpm (> 1000 rpm)
Dimensions / Weight: 6.2 x 2.0 x 1.3" (160 x 50 x 33 mm) / 6.4oz (182g)
Complete with cone tip and wheel for rpm orlinear surface speed, four 1.5V AAA batteries, andreflective tape