Anti-drop cover, detachable protective cover, split design protection is more in place. With a backlit LCD display, it can work normally in dim conditions. Small and easy to use, exquisite appearance, compact and elegant, easy to carry. Six standard wavelengths, 850nm, 980nm, 1300nm, 1310nm, 1490nm, 1550nm, 1625nm, power is -50 ~ +26dBm. It automatically shuts off if not operated for 10 minutes, saving power and long usage time. Item Type: Optical Power Meter Material: ABS Color: As the picture shows Product Model: KPM-25m-C Wavelength Range (nm): 850~1625 Power (dBm): -50~+26dBm Uncertainty: ≤±0.25 Linearity (dB): ≤±0.1 Standard Wavelength (nm): 850, 980, 1300, 1310, 1490, 1550, 1625 Display Resolution: 0.01 Working Temperature (℃): -10~+60 Storage Temperature (℃): -25~+70 Auto Shut-off Time (min): 10 Continuous Working Time of Battery (h): 20 Power Supply: 2 x AAA 1.5V batteries (not included) 1 x Optical Power Meter (battery not included) 1 x User Manual Your 100% satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will provide you with the best solution!