Loading... Please wait...A LED Tester for regular loose LEDs including 1.8mm, 2mm, 3mm, 2x3mm, 2x3x4mm, 5mm, 8mm, 10mm, and Super Flux (Piranha) LED with 9V Battery. Do not put regular LED into high current, you will kill your LED. The tester has constant current output from 0 to 150mA available.