Klein Tools Clamp Meter CL320 400A AC Auto Ranging Multimeter (True RMS 600V DC Microamps Temperature Capacitance NCVT HVAC Circuit Diagnostic Tool) Planer Restricted Clearance Mechanical Chases: Clamping Restricted Clearance Mechanical Chases: Clamping onto round black iron pipes and threaded couplings at offset approach angles up to 30 degrees where structural framing and adjacent lines block swing arcs Dual Speed Selection Mechanism: Mechanical switch limits output parameters to 0 2 Rugged Impact Defense: Hardened double insulated Class 2 chassis matrix withstands raw jobsite concrete floor drop impacts from up to 6 The Klein Tools CL320 is an automatically ranging True RMS digital clamp multimeter engineered for the direct measurement of electrical current up to 400A AC and potential up to 600V AC DC