The Instek GDM-531 Handheld Digital Multimeter is a compact, high precision, battery operated multimeter designed to meet the application requirements of service engineers. The GDM-531 design is driven by mobile-oriented features: automatic power-off to preserve battery life, a large backlight display for crisp viewing, a rotary selector and push buttons to ease operation, and NCV (Non-Contact Voltage) function for outdoor use.

The basic functions of the GDM-531 match the extensive functionalities of bench-top multimeters: fuse-protected current input, True-RMS for accurate AC measurements, Audible/Visual Alarm when Overload, Auto Ranging, Duty Cycle and Relative Mode.