The Metrohm 7A501 insulation tester is used in testing circuits and equipment in hazardous areas for example where there is methane, ammonia or hydrocarbons present.
The Kewtech KT35 Digital Insulation Continuity Tester has 250, 500 & 1000 V insulation test ranges, insulation measurement to 2000MΩ and continuity measurement to 2000Ω