We are offering digital insulation tester. Models dit 99a ranges 0 - 20 m ohms testing voltage dc 100 v resolution 0.01 m ohms models dit 99b ranges 0 - 200 m ohms testing voltage dc 250 v resolution 0.1 m ohms models dit 99c ranges 0 - 200 m ohms testing voltage dc 500 v resolution 0.1 m ohms models dit 99d ranges 0 - 200 m ohms testing voltage dc 1000 v resolution 0.1 m ohms models dit 99e ranges 0 - 2000 m ohms testing voltage dc 1000 v resolution 1 m ohms.