can measure 8 standdard wavelengths 850/980/1300/1310/1490/ 1550/1625/1650nm , test range: -70dBm~+6dBm, 1mw red . Support lighting,Support automatic shutdown,Support backlight selection, Support wavelenghth memory function,Support user calibration. Support /SC/ST universal interface,Support RJ45 testing,Support simultaneous disply of linear mW and non-linear index dBm. The light power meter & VFL ,Test precision, fine workmanship, easy to carry,completely replace the optical power meter and red pen 2 products. Accuracy: +/-0.05dB Display resolution:mW:0.1% ,dBm:0.01dBm Working temperature:-10~+60Celsius Storage temperature :-30~+70Celsius Auto off time:10Min Battery continuous operating time:greater or equal to72h Weight: 140g colour:Orange Material:plastic size:11.2x6.6x3cm Package Contents: 1 * optical power meter 1 * RJ45 test module Only 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.