PT-110 is a simple model to use, ergonomic, rugged test instrument that operates with optical laser technology. This velocity analyzing and measuring device is ideal for rotational machine inspection and process speed analysis. The PT-110 possesses a large backlit LCD screen that provides clear viewing in any environment. Users can obtain results in either Hertz or RPM, as well as Total counts with the simple selection switch. During testing, the unit automatically saves maximum, minimum, last recorded values and up to 96 logged data readings. Specifications include... Range: 2.5 - 99999 RPM; 0.05 - 1666Hz Display: 5 digit LCD Accuracy: +0.05% of reading Sampling Time: 0.8 second (over 60 RPM) Laser Detection Measuring Distance: 2-20" Memory: Stores MIN, MAX, Last Value & 96 readings Power: 3 1.5V AAA Batteries Weight: 0.4 lb Resolutions... 0.1 RPM (2.5 - 999.9 RPM) 1 RPM (above 1000 RPM) 0.01 Hz (0.05 - 99.99 Hz) 0.1 Hz (above 100 Hz)