This is the Megger PAT420, a professional-grade PAT tester that's also the upgraded version of the Megger PAT410. New features exclusive to this model include a wider range of earth bond/continuity test currents (200mA, 10A and 20A) to test a wider amount of appliances at full strength (or use the low current 200mA test for IT equipment) and this tester also comes as standard with its own 110V appliance connector, meaning there are absolutely no external adapters required to test your 110V appliances! The 110V connector makes the Megger PAT420 an excellent choice for those working on construction sites or other areas where 110V tools are regularly used. Only selling as I have upgraded to a PAT450