1. The stroboscopic speedometer is made of plastic material, and the large LCD backlit display is convenient for reading data in the dark 2. The digital stroboscope adopts digital control to adjust the flash frequency, low power consumption, with speed storage, and improves measurement efficiency 3. The stroboscope adopts advanced technology such as photoelectric technology and anti interference technology, which is very powerful 4. The product realize non contact speed measurement, detect the state of moving objects and defects 5. The LCD stroboscope is compact in design, easy to carry and store, adopts handheld and non contact measurement, portable and safe Item Type: Digital Stroboscope Measuring Range: 60-19999rpm Adjustable Speed: Less than 1000rpm: Coarse Adjustment: 10rpm Fine Adjustment: 0.1rpm 1000rpm: Coarse Adjustment: 100rpm Fine Adjustment: 1rpm Error: 0.05% Resolution: Less than 1000rpm: 0.1rpm 1000rpm: 1rpm Batteries: 4 x AAA batteries(not include) Color: As Shown Material: plastic Package Contents: 1 x Rotational Speed Measuring Instrument Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.