High voltage testing devices from the GLP1-e family serve for testing insulation capability and electric strength (clearance and leakage path) at electric modules and componentry according to a great variety of national and international regulations. They are ideally suited for fast and uncomplicated manual testing in production. The integrated minicomputer allows a clear and functional operation. Manual testing with safety test pistols, automatic tests with target time and various monitoring functions or "burning” – this can all be done quickly without generating test programs following the motto: switch on - test – done!