Features 1、Non contact digital tachometer has high accuracy and adopts high‑speed laser aiming operation to ensure accurate measurement. 2、Equipped with a large LCD display screen, it is easy to read, and it is more convenient to measure in the dark environment. 3、Speedometer has the functions of storing upper limit, minimum and maximum readings, and automatic zero adjustment. 4、The digital laser tachometer can be used to measure motors, machine parts, lathes, etc, which has a wide range of application. 5、Easy to measure, so you can put the battery into the instrument, press the MEM button and aim at the object to be measured. Specification Item Type: Laser Tachometer Model: DT-2234C+ Material: ABS Battery: 1 x 9V 6F22 (Battery Not Included) Uses: can be used to measure motor, machine parts, lathe, etc. Display: 5 digits, 18mm (0.77in) LCD (liquid crystal display), with alarm function Accuracy: ±(0.05%+1 digit), expressed as% of reading + least significant digit Sampling Time: 0.8 seconds Test Range Selection: Automatic Time Base: Quartz Crystal Detection Distance: Approx. 50mm-500mm / 2.0-19.7in Test Range: 2.5~99999 revolutions per minute (r/min) Working Temperature: 0~50℃ (32~122℉) Resolution: 0.1RPM (2.5~999.9RPM), 1 r/min (more than 1000 r/min) Package List 1 x Laser Tachometer (Battery Not Included) 3 x Reflective Strip 1 x Storage Bag 1 x Manual