The Metrix Plus - 99999 RPM Digital Tachometer is a digital measurement device that accurately measures a rotating shaft or motor's rotational speed and angular velocity. The 99999 RPM Digital Tachometer is a lightweight hand-held device available at a minimal price in the market. The RPM Digital Tachometer by Metrix Plus is tested to produce accurate results with minimal or no errors at all. The device's LCD screen can view the recorded maximum value, minimum value, average value, and last measured value. The backlit LCD helps users view the measurements in the dark as well. The battery-operated device has a low battery indicator for ease of use. Product Specifications: Manufactured by: Metrix Plus Product Code: DT 2234BL Range: 2.5-99999rpm Resolution ratio: 0.1rpm (2.5 - 999.9rpm) 1rpm (1000 - 99999rpm) Sampling ratio: Once/ second Measurement distance: 50 - 500mm Power supply: 2 x 1 .5V AAA Battery Weight: 106g