Description:  UT373 is a reliable digital non-contact tachometer used to measure rotation speed of motors and other machines. This device is able to display results in RPM or revolution count. This portable device is able to safely measure rotational objects through a non-intrusive method.     Specifications:  RPM measurement: Range: 10.0~9999.9RPM; 10000~99999RPM.  Resolution: 0.1.  Accuracy: ±(0.04%+2).  Resolution: 1.  Counting measurement:  Range: 0~99999 count.  Resolution: 1 count (120 rpm  for 1s).  Sensor type: Photodiodes and laser tubes.  Target distance: 50mm ~ 200mm.  Measuring angle: The angle between the laser and the surface being measured is less than 30 °.  Display: 5-digit segment code; 99999 max display.  Drop test: 1m.  Working temperature and humidity: 0 ° C to 50 ° C (no more than 80%RH).  Storage temperature and humidity: -20 ° C to + 60 ° C (no more than 80%RH).  Protection rating: IP65.  Power supply: 3 1.5V batteries (AAA) (NOT Included).  Battery life: Continuous work for 12 hours.  Product color: Red and grey.  Product weight: 85g (excluding battery).  Product size: 183.8 x 56 x 34mm.     Package Included:  1 x Mini Digital Non-contact Tachometer