The Metrohm brand of test equipment was originally manufactured by Edgcumbe Instruments in Glasgow.
Their most popular product was the Metrohm insulation and continuity tester which was developed as an intrinsically safe tester for use down coal and salt mines and hazardous areas. This instrument is now known as the Metrohm 7A501C Safety Insulation Tester. They also manufactured the Metrohm Live Line Tester Kit which is used to perform measurements on live voltage and phasing on overhead lines. There are a range of kits available for system voltages of 3.3kv, 6.6 kv, 11kv, 13.8 kv and 33kv (50/60Hz) designed to operate within the temperature range -25 degrees C to 50 degrees C.
Other products available are the Metrohm E1612 compact 4 pole earth resistance tester for accurate measurement of earth resistance and soil resistivity and the Metrohm E1622 milliohm meter which uses a four wire system for accurate low resistance measurements.