Amprobe LH41A [3030898] Low Current Clamp On Ammeter. The Amprobe LH41A clamp-on ammeter offers precise low current measurement from 0 - 40 A DC or AC pk and precise low-current measurements with 1 mA resolution. The LH41A clamp on ammeter features auto ranging, data hold, and auto power off functions making the meter extremely easy to use.