Automatic loop evaluation built-in loop impedance tables allow automatic evaluation of loop impedance compared to the regulations. Help screens unit comes complete with in-built help screens for referencing on site. Online Voltage Monitoring Monitors all 3 voltages in real-time. Upgradeable If changes occur to the regulations changes can be made to the unit to keep the unit up to date. Polarity swap automatic polarity reversal on continuity test. Insulation wide range of insulation test voltages from 50 V to 1000 V reading up to 999 MO. Trip Lock function Zs RCD function performs a loop test without tripping the RCDRCBO. Built-in charger & rechargeable batteries Unit has an in-built charging circuit & comes complete with a set of rechargeable Ni MH batteries.RCD Auto Automated RCD testing reduces circuit test time. Phase sequence test required by BS76712008 17th Edition. BHow does it work Bbr The Metrel Eurotest COMBO 17th Edition tester means that you can test & certify fixed electrical installation in compliance with the Part P 17th Edition regulations BS7671 & BS EN61557. The MI3125B can perform a variety of electrical tests including Continuity Testing Insulation Testing Automatic RCD testing including RCD Ramp Testing with a no RCD trip feature Earth Loop impedance testing & PSC prospective short circuit current. br Basically all the tests you need to fully ensure safety within electrical installations in both commercial & domestic environments. The Eurotest COMBO can even perform online voltage monitoring & phase sequence testing for 3 Phase installations. brbr The MI3125 B1 has inbuilt Fuse Characteristics tables which allows for easier evaluation of the Loop Resistance in accordance with BSEN7671. Calculations & Tables are no longer necessary with this feature. Additional Help screens describing how to connect the instrument into the installation & how to perform the test are also inbuilt.br Metrels Eurotest COMBO is also the first multifunction tester on the UK which performs RCD testing on B Type RCDs. Something which will undoubtedly become an asset in the future. The long term reliability of this multifunction tester is guaranteed & the tester comes supplied with a manufacturers calibration certificate. brbr The MI1325 B1 is used by Electricians Electrical Contractors & Engineers. Due to Part P they are also used by Plumbers Heating Engineers Kitchen Fitters Builders & Bathroom Fitters.