Klein Tools CL312 Clamp Meter is designed to help HVAC professionals do their jobs faster and easier without compromising durability and reliability. The CL312 is an automatically ranging true root mean square (TRMS) digital clamp meter that measures AC current via the clamp, AC/DC voltage, DC microamps, resistance, continuity, frequency, capacitance and tests diodes via test-leads and temperature via a thermocouple probe. Features include Auto Range to improve efficiency and speed when making measurements; Diode Test to troubleshoot malfunctioning diodes; Max/Min to understand the variability from average of an electrical property being measured and DC Microamps measurements when working with flame sensors.