No more guessing what range to switch your meter to the TPI 100 does it automatically! Automatically switches between ACV, DCV, and ohms (resistance). Benefit Simple to use. Meter selects function and range, just connect the leads to the device under test. Single button operation. Benefit EZ to use. Enables users with limited knowledge to perform tests safely. 0 to 600 volts AC and DC Benefit Enough range to safely perform measurements 10 M? internal impedance. Benefit High impedance prevents inaccurate reading caused by circuit loading. Auto power off. Benefit Increases battery life by turning off the multimeter when not in use. 4,000 count display Up to 40M? cULus 61010-1 CAT II 1,000-V / CATIII 600V 3 Year Limited Warranty.