Fluke 3540 FC KIT 3-Phase Power MonitorSpecifications :Operating temperature : <10 °C to +45 °C (+14 °F to +113 °F) Storage temperature : <20 °C to +60 °C (-4 °F to +140 °F), with battery: -20 °C to +50 °C (-4 °F to +122 °F) Operating altitude : 2000 m (6,500 ft) (up to 4,000 m derate to 1000 V CAT II/600 V CAT III/300 V CAT IV) Storage altitude : 12,000 m (39,000 ft) IP rating : IEC 60529:IP50, in connected condition with protection caps in place Vibration : MIL-T-28800E, Type 3, Class III, Style B Voltage range : nominal 100 V to 500 V (85 V min to 550 V max) using safety plug input Mains power : nominal 100 V to 240 V (85 V min to 265 V max) using IEC 60320 C7 input Power consumption : Maximum 50 VA (max. 15 VA when powered using IEC 60320 input) Standby Power : <0.3 W only when powered using IEC 60320 input Efficiency : ≥ 68.2 % (in accordance with energy efficiency regulations) Mains frequency : 50/60 Hz ± 15 % Battery power : Li-ion 3.7 V, 9.25 Wh, customer-replaceable On-battery runtime : Up to 4 hr (up to 5.5 hr in energy saving mode) Charging time : <6 hr