... at the same time.6,TEST1 with magnetic ballast inside could test T8 fluorescent tubes of 20W(60cm),30W(90cm),36W ... it can test different lamps with different base9,With terminal holders, it could test any electrical products with wire.10,With fuse inside the power ... non-human reason error, free of charge replacement is available. LED lamps,tubes and CFL ligts demo case -T8 full range power meter