Manual- and auto-ranging intrinsically safe digital multimeter for use in dangerous or explosive atmospheres including oil refineries, mining operations, and pharmaceutical plants True RMS meter provides accurate readings when measuring linear or nonlinear loads where the current or voltage has a sinusoidal or nonsinusoidal waveform Measures voltage, current, conductance, duty cycle, capacitance, frequency, and temperature, and performs resistance, continuity, and diode tests Low-pass filter blocks unwanted voltages when measuring AC voltage and AC frequency to provide accurate measurements on inverters and variable-frequency motor drives Certifications and safety standards include Ingress Protection certified IP67; Class I, Div. 1 - Zone 1 and 2 (gas); Class II- Zone 21 (dust); Class II, Div. 1; Temperature Class T4; Category III installations up to 1000V, Category IV installations up to 600V, and Pollution Degree 2 for indoor use.