Klein Tools CL220 Digital Clamp Meter, AC Auto-Ranging 400 Amp with TempKlein Tools CL220 The CL220 measures AC current and NCVT via clamp and AC DC voltage, resistance, and continuity via test leads, and temperature with thermocouple. The meter features automatically ranging True Root Mean Squared (TRMS) measurement technology for accuracy. Additionally, a backlit LCD makes viewing in low light easy. Measures AC current and NCVT via clamp and AC DC voltage, resistance, and continuity via test leads, and temperature with