Welcome to
Azur Electronics

Avo and Megger of Dover, Kent, are part of the Megger Group and make electrical power testing equipment.

I keep on my Bench an Avometer 8 Mk 6 Multimeter and a Megger BM101 Continuity & Insulation Tester.

I also have a portable electrical safety testing kit. This consists of: an Avometer 2001 Multimeter, a Megger BM100 Insulation Tester, a Megger CBT2 RCD (Residual Current Circuit Breaker) Tester, a Megger LT5 Digital Loop Tester and a Megger LT7 Digital Loop Tester. Other non-Megger items are: an Azur IRT112 Insulation & Resistance Tester, an Azur LTX110 Loop Tester Extension Box, a Mains Testing Neon Screwdriver, a TSN261 Mains Socket Outlet Tester and various test leads. These were all needed for my house building project.

The IET Wiring Regulations (BS 7671) 17th edition sets the standard for electrical installations in the UK and many other countries.


Take care when testing circuits at mains voltage levels.

Risk of electric shock.

Read the Instruction Manual for the test equipment first!

This is a job for electrically qualified personnel.

Avometer 8 Mk 6 with test leads. This is the iconic AVO and will measure ac and dc voltage and current, and resistance.

Ranges are:
0 - 3Vac to 0 - 1kVac
0 - 3Vdc to 0 - 1kVdc
0 - 10mAac to 0 - 10Aac
0 - 50µAdc to 0 - 10Adc
0 - 2kΩ, 0 - 200kΩ, 0 - 20MΩ

Used on my Bench mainly for mains ac current measurements.

Megger BM101 with test leads.

It measures continuity 0-2Ω, resistance 0-200Ω, resistance 0-1MΩ and insulation 0-200MΩ at 500Vdc.

Unlike the BM100 it does not have the measurement of ac voltage to 500V.

Used on my Bench for testing devices under test (DUTs) for power line insulation and continuity safety tests.

Avometer 2001 with test leads. This will measure ac and dc voltage and current, as well as continuity, resistance and insulation. Actually made by Thorn EMI Instruments when they owned Avo.

Ranges are:
AC Volts 200mV, 2V, 20V, 200V, 1kV.
DC Volts 200mV, 2V, 20V, 200V, 1kV.
AC Current 200µA, 2mA, 20mA, 200mA, 1A, 10A.
DC Current 200µA, 2mA, 20mA, 200mA, 1A, 10A.
Resistance 200Ω, 2kΩ, 20kΩ, 200kΩ, 1MΩ, 20MΩ, plus dc/diode resistance/continuity.

Megger BM100 with test leads.

It measures continuity, 0-2Ω resistance 0-200Ω resistance and 0-200MΩ insulation at 500Vdc.

Unlike the BM101, it also indicates the presence of ac voltage to 500V as a warning of a live circuit.

Megger CBT2 Residual Current Circuit Breaker Tester.

This will test RCDs, RCBOs, RCCBs (earth leakage circuit breakers) at test currents from 3mA to 500mA, then measure the trip time in ms. A polarity switch is provided to test with a positive or negative going waveform. It also has orange neon lamps to indicate Phase-Neutral and Phase-Earth.
Megger LT5 Digital Loop Tester.  
This will test the Line (or Phase) to Earth Loop impedance for socket outlets. Two ranges are provided: 0-20Ω for TN earthing systems; and 0-200Ω for TT earthing systems. It also has orange neon lamps to indicate Phase-Neutral and Phase-Earth.

Megger LT5 Digital Loop Tester with Azur LTX110 Loop Tester Extension Box and Test Cables.

This Extension Box facilitates testing with either a conventional power cable (CEE22 Socket to 3 Pin Plug) or with test leads for earth bonding tests. This is useful for testing appliances and exposed metalwork are correctly earthed.

NOTE: this will trip RCDs, RCBOs, RCCBs. See Megger LT7 below.

Megger LT7 Digital Loop Tester and Test Cables.

This provides a test at 15mA which will not trip 30mA RCDs. Although it has a non-standard connector, there are 3 separate test leads provided: 13A plug for sockets; 2 probes for direct connections; and 13A plug with earth probe for bonding tests.

Azur IRT112 Insulation & Resistance Tester.

This is a useful test aid to calibrate test leads and test equipment for continuity, resistance and insulation. It provides a short-circuit, resistances of 1Ω, 10Ω, 100Ω, 1kΩ, 10kΩ, 100kΩ, 1MΩ, 10MΩ, 100MΩ and open-circuit.

Mains Testing Neon Screwdriver.

This has the screwdriver tip connected to a neon lamp and high value resistor in series. When you touch the red cap of the screwdriver this provides a leakage path to earth. If the circuit being tested by the screwdriver is live then the neon will illuminate.

These are out of favour now, in case the resistor fails in short circuit mode and then you will get an electric shock! Also the neon can be difficult to see in bright daylight. Better to use a Multimeter, however this does rely on both poles being connected! So I still use this screwdriver.

TSN267 Socket Outlet Tester.

I made this battered old unit about 40 years old and still fit for purpose! It has 230V red neon lamps connected between Live & Neutral, Neutral & Earth, and Earth & Live. If the socket is correctly wired only the L-N and E-L neons should illuminate. It also has 4mm test sockets connected to L, N & E to facilitate testing with a Multimeter.