Maintenance 1. PressON/OFF* to turn it on/off. Press #34;ON/OFF #34; shortly to activate or deactivate 10 minutes auto-off function. 2. Press #34; dB #34; to switch fron absolute measurement mode to relative measurement mode. 3. Press #34; #39; to change wavel ength. 4. PressZero #34; for 2 Sec to self-zero set. 5. Press #34;L.ight #34; to turn on/off backl ight. 6. Press #34;Light +A #39;to enter user Calibration mode : press #34;light #34;to add 0. 05dB. press #39;dB #34; to mi nus 0. 05dB, Press #34;ON/OFF to save the sel f-cal ibrat ion Setting. 7. Input Range:-50--+26dBm Type:JW3208C