Quartz Sleeve for Pentek UV 120 2 UV Light Bulb ES01356LMP 000 uW cm2 Handheld UV Lamp 000 uW cm2 Handheld UV Lamp with White LED and evenly balanced for comfortable use Length: 532 mm A good way to think about it is that if you have trouble seeing through the sleeve then it is very likely that UVC light has trouble passing through it
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