PM51A - 

These unique meters have a full complement of features in a package only 3⁄8 inch thick, under 3 oz. for the utmost in shirt-pocket portability. Each model is fully autoranging and has an oversized easy-to-read LCD display. Although very small, each meter is fully UL safety rated to CAT III levels. The Ampro PM Series of shirt-pocket meters include measurement function extras such as capacitance and frequency and safety extras such as transient protection to 4 kV and overload protection to 600 volts.

Measures AC/DC Current, Capacitance, Frequency, Continuity with Beeper

Power Supply 3 V Standard Button Battery × 1 (IEC-CR2032; ANSI-NEDA-5004LC)

Automatic Power Off