The Sperry TRMS 10 Function Digital Multimeter has precise True RMS circuitry for accurate readings of non-linear waveforms. Non-contact voltage detection is integrated into the multimeter design. This multimeter is equipped with a min/max function to hold either minimum reading or maximum reading on the display. Relative Delta displays change in readings. Data hold feature captures reading on the display. Large backlit LCD display with bar graph indication. Impact resistant housing with protective rubber boot. Operates from one 9 volt battery (included).