Instrument comprises of two analog MO65 meters 2V & 50mA for voltage & current measurement. Solar cell unit mounted separately on an Acrylic Box & metal stand is provided to hold solar cell Unit. Light source 200 watt lamp is enclosed in a special metal box. Instrument supplies with built in 10 nos. of load resistances 470, 220, 150, 100, 82, 68, 47, 33, 22, 10 ohms & SC. Load control is through one pole 11 way special heavy band switch. Wooden plank with half meter scale fitted on it.