Features Multi Function: The digital contact tachometer has memory function, minimum and maximum readings; With automatic zero adjustment function. Automatic zero setting, storing the last, minimum and maximum readings. High speed infrared aiming operation. Wide Application: The digital contact tachometer with wide speed (photo and contact) and linear surface speed / length (contact) measurement. Suitable for measuring motors, mechanical parts, lathes, etc. LED Display: The visible red light of LED can accurately measure the product speed and surface speed. The readings are displayed on a large, easy to read LCD screen and can also be used in the dark. Fast and Accurate: The digital photo tachometer provide fast and accurate rotating object speed measurement and surface speed measurement MPM. The tachometer measures speed in revolutions per minute. The information is displayed on a large and easy to read LCD screen. Compact Design: The lightweight design of digital contact tachometer and photoelectric tachometer makes it easy to obtain speed readings for diagnostic and measurement purposes. Specification: Item Type: Tachometer Product Material: ABSProduct Model: DT2236C Measuring Range: Contact Type: 0.5-19999rpm Non Contact Type: 2.5~99999rpm Resolution: Contact Type: 2.5~999.9rpm: 0.1rpm, >1000rpm: 1rpm Non Contact Type: 0.5~999.9rpm: 0.1rpm, >1000rpm: 1rpm Error: ±(0.05% + 1 Digit) Sampling Time: 0.8s Ship without Batteries, Use 4 AA Dry Batteries Package List: 1 x Tachometer 2 x Reflective Tape 4 x Measurement Module 1 x Manual Note: Please refer to the instruction manual. Package List 1 x Tachometer 2 x Reflective Tape 4 x Measurement Module 1 x Manual