TPI 183A true RMS DMM. True RMS DMM with temperature, capacitance, duty cycle, & low-pass filter. Auto/manual ranging. Temperature measurement. Duty cycle to measure the amount of time the motor is on. Low pass filter for noisy environments. Separate fuse (2) and battery compartment. Auto power off. IR serial interface. CAT II - 1000V, CAT III - 600V. 3 Year Limited Warranty.