Once connected, turn on the optical power meter and let it warm up for a couple of minutes. Next, set your optical power meter to the color and power of the light. Model Introductions TL-510A: Measurement range: -70~+10dBm,calibrated wavelength:850nm、1300nm、1310nm、1490nm、 1550nm、1625nm TL-510B: Measurement range: -50~+26dBm,calibrated wavelength:850nm、1300nm、1310nm、1490nm、 1550nm、1625nm 2. Features High measurement accuracy and display resolution Quick. REF Relative power:Press REF for 2 seconds to 9. Function Keys ON/OFF:press ON/OFF to turn it on. Under power-on mode, 10-minute auto off function. It features a wide measurement range of -70 to +10dBm or -50 to +26dBm, six calibrated wavelengths, and high accuracy of ±3% (-10dBm, 22℃). Now the Ref. remove-circle Internet Archive's in-browser bookreader "theater" requires JavaScript to be enabled. We have 1 Tianlan Tl-510 manual available for free PDF download: User Manual Tianlan Tl-510 Pdf User Manuals.