Features Features: The stroboscopic speedometer is made of good quality plastic material, and the large LCD backlit display is convenient for reading data in the dark. Durable, stable performance, long-term use. Digital Stroboscope: The digital stroboscope adopts digital control to adjust the flash frequency, low power consumption, with speed storage, and improves measurement efficiency. This hand-held tachometer is very accurate and does not touch. Advanced Technology: The stroboscope adopts advanced technology such as photoelectric technology and anti interference technology, which is very powerful. Realize non contact measurement to detect the state and surface defects of moving objects. Non Contact: The digital stroboscope realize non contact speed measurement, detect the state of moving objects and surface defects. It can provide you with accurate speed readings from a distance. Compact in Design: The LCD stroboscope is compact in design, easy to carry and store, adopts handheld and non contact measurement, portable and safe. Its lightweight design makes it easy to obtain speed readings for diagnostic and measurement purposes. Specification: Item Type: Digital Stroboscope Product Material: ABS Product Model: DT2239B Measuring Range: 60-19999rpm Adjustable Speed: ＜1000rpm: Coarse Adjustment: 10rpm Fine Adjustment: 0.1rpm ＞1000rpm: Coarse Adjustment: 100rpm Fine Adjustment: 1rpm Error: 0.05% Resolution: ＜1000rpm: 0.1rpm ＞1000rpm: 1rpm Batteries: 4 x AA batteries(not include) Package List: 1 x Stroboscope 1 x User Manual Note: Do not aim the flashlight at your eyes. Package List 1 x Stroboscope 1 x User Manual