Fast and accurate. No need to wait for warm-up, just plug and play. +/- 5% uncertainty, -70 to +6 decibel meter measurement, relative power calculation, calibration function.Durable. Sensitive chip and solid internal structure. Low power consumption, continuous work for 48 hours. (Excluding 3 AA batteries)Transparent blue screen. Details mean professional, unique results or information display to ensure a satisfactory user experience.6 Wavelength and light source. 850/1300/1310/1490/1550/1625 nanometer + 5km red light locator + SC//ST adapter. Meet most of the requirements of CCTV communication engineering maintenance.The convenient size is right.Material:plasticcolour:bluePackage Contents:1 x Optical fiber power meterOnly the above package content, other products are not included.Note: Light 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.