1. The non-contact digital tachometer has high accuracy and adopts high-speed laser aiming operation to ensure accurate measurement.2. Equipped with large LCD screen, it is easy to read and it is more convenient to measure in dark environment.3. The speedometer has the functions of storing the 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 applications.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 TachometerModel: DT-2234C+Material:ABSBattery: 1 x 9V 6F22 (battery not included)Uses: Can be used to measure motor, machine parts, etc.Display: 5 digits, 18 mm (0.77 inch) LCD (liquid crystal display), with alarm functionAccuracy: (0.05%+1 digit), expressed as % of reading + least significant digitSampling time: 0.8 secondsTest range selection: automaticTime base: quartz crystalDetection Distance: Approx. 50mm-500mm / 2.0-19.7inTest range: 2.5 to 99,999 revolutions per minute (r/min)Operating Temperature: 0~50(32~122)Resolution: 0.1 rpm (2.5 ~ 999.9 rpm), 1 rpm (over 1000 rpm)Package List:1 x Laser Tachometer (Battery not included)3 x reflective strip1 x storage bag1 x Manual