New user-friendly portable multimeter is designed for use in applications involving combustible or explosive atmospheres. The new Model ISDMM multimeter provides convenient, accurate confirmation of a low-resistance path to verified ground points, as well as confirming the integrity of existing bonding/grounding conductors. The Model ISDMM also provides readings of DC voltage and amperage, capacitance, frequency, temperature, duty cycle, pulse width and an event counter. It is equally well-adapted to use with permanently bonded equipment or temporary devices such as grounding clamps, cables and reels. It may also be used to ensure the grounding of conductive or semi-conductive hose assembles used for transfer of flammable or combustible products where it is important to achieve continuity over the complete hose length, including fittings.