OMEGA HHM10, HHM20 and HHM30 Series of handheld digital multimeters have a GS-Mark EN61010-1 approval, Over-Voltage Category II 600 Vdc/Vac; pollution degree. The HHM26 and HHM28 models have RS-232 interface. All the multimeters include a free protective rubber boot with tilt stand, set of safety test leads and 9V alkaline battery. They have a stated accuracy at 23 +/-5°C < 75% RH and a battery life of 200 hours. Their dimensions are 7.6 in. x 3.6 in. x 2.1 in.