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Check the listing for details. HOT! LCD Optical Light Power Meter Tester ST816B-15mw New enpod. Condition: New. Listed at 161.31 USD. ST816B Visual Fault Locator—Pen Size. Output power 15mw. tor--2.5mm universal adapter: use 2.5mm universal adapter. 650nm visual fault locator has the function of fiber. --Support CW and 2Hz modulation work mode.