1,10 WAVELENGTH AND VFL: This fiber optic power meter has VFL and 10 wavelength, 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650 nm and with SC FC ST adapter for use. 2,AUTO SHUTDOWN TIME: Our VFL optic power net cable tester meter has 10 mins automatic power off function and testing fast and accurate. 3,ACCURATE MEASUREMENT: No need to wait for warm up, VFL optic power net cable tester can do plug and play with accurate measurement, relative power calculation, calibration function. 4,40 HOURS WORK TIME: VFL optical power meter adopts sensitive chip and rugged internal structure. Low battery consumption and longer working time. And work for 40 hours straight. 5,ABS MATERIAL: Fiber optic power meter is made of excellent ABS material and VFL covering most of the requirements of communication engineering maintenance. Item Type: Fiber Optic Power Meter Material: ABS Red Light VFL Detection Distance: 20km Power Supply: AAA Batteries Required x 2 (Shipped Without Batteries) Probe Range: InGaAs Wavelength Range: 850-1650nm Standard Wavelength: 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650nm Display Resolution Linearity Display: 0.1 percent Logarithmic Display: 0.01dBm Operating Temperature: -10 - and60℃ Storage Temperature: -25 - and70℃ Auto Shutdown Time: 10 Minutes Battery Duration: Not Less Than 40 Hours 1 x Optical Power Meter 1 x Lanyard 1 x Instruction Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.