Toptronic Earth Resistance Clamp-on Tester • Jaw size 32mm • 0.01 Ohm High accuracy for low resistance measurement • 0.001 Ohm High Resolution • Record 99 Resistance Measurements • With alarm function of resistance limit, set alarm threshold • Current overload display:>20A RMS • Batteries included Model Specification: · Dimensions (mm): 276(L) x 104(W) x 54(H) · Weight: 1050g · Power Source: 9V Battery