Megger MFT1720 Multifunction Tester

This comprehensive MFT1720 Multifunction Tester is ideal for extensive 17th Edition & Part P testing. A must have installation tester.
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Megger MFT1720 Multifunction Installation Tester With Free Accessories

This product has now been discontinued and replaced by the Megger MFT1721 Multifunction Tester.

The Megger MFT1720 Multifunction Tester for all 17th Edition and Part P testing applications on electrical installations. The Megger MFT 1720 is a great electrical installation tester for electricians who want to test, certify or fault find on domestic and commercial properties. Tests included are supply measurement, continuity, insulation (including a 1kV insulation test), Zmax and& R1+R2 loop testing and 10mA, 1A and auto RCD testing with an additional leakage current measurement option available. The MFT1720 multi-function tester has been designed to continue working when connected across phases, when connected to a live circuit and when the incorrect range is selected making this one of the most reliable testers on the market.

Megger MFT1720 17th Edition Tester Features:

  • Insulation testing at 250V, 500V and 1kV with adjustable alarms
  • 200mA and 15mA Continuity tests
  • 2-wire no-trip & high current loop testing with Zmax and R1+R2 values
  • Polarity test
  • RCD ramp test
  • Adjustable insulation alarms
  • Phase to phase loop test
  • RCD auto test & programmable tripping current level
  • 3 phase RCD test
  • Phase rotation test
  • Auto-start tests on continuity and loop resistance – no need to push the button
  • Dual display shows loop resistance and fault current results simultaneously
  • Dual test buttons for left or right-handed operation
  • Test lockout
  • Safe contact detector
  • Live circuit warning
  • Auto discharge
  • Analogue arc display
  • Remote switch probe included
  • Weatherproof to IP54
  • Input protection against accidental connection to live circuits
  • CAT IV 300V safety standard

The MFT 1720 has a balanced neckstrap for hands-free operation with a TEST button on both ends of the tester for either left or right-handed testing. The large character dual display with backlight allows for two parameters to be shown at one time and colour coded range selection dials make this an intuitive and straightforward multifunction tester to use. The rugged design and IP54 rated rubber moulding of the MFT1720 allow the instrument to withstand tough conditions and heavy handed treatment. Together with a CAT IV 300V safety rating the Megger 1720 is a 17th Edition tester designed for safe using either inside or out. The carry case for this new Megger 17th Edition tester ensures the safe transportation of the instrument when travelling between tests and has extra space for the storage of tools, test leads and a certificate pad.

You can read more in our Megger MFT1700 series overview, featuring detailed information about each tester's suitability for a range of needs.

Megger MFT Comparison Table

  MFT1710 MFT1720 MFT1730 MFT1730 Onsite MFT1735
200mA Continuity Test
Automatic Start Continuity Test  
Insulation Resistance Test 250 & 500V 250, 500 & 1000V 100, 250, 500 & 1000V 100, 250, 500 & 1000V 100, 250, 500 & 1000V
RCD Test
Automatic RCD Test  
RCD Ramp Test
Type B RCD Test    
2 Wire Anti-trip Loop Test
R1+R2 Value Displayed  
2 & 3 Pole Earth Resistance Test     
ART Earth Resistance Test         Option
Stakeless Earth Resistance Test         Option
Earth Spike Kit Included      
Download Memory    
Software Included        
Leakage Current Measurement   Option Option Option Option
Remote Test Probe Included  

What's In The Box?

  • 3-wire test lead set with croc clips
  • SP5 Switched probe
  • Mains plug test lead
  • Neck strap
  • Quick-start guide
  • Hard carry-case
  • 8 x AA batteries
  • Manufactures Calibration Certificate
  • Manufacturers 3 year warranty

If you require a detailed specification please see the Megger MFT1700 Series pdf Megger MFT1700 Series PDF

Insulation test

  • Output voltage: -0% +20% at rated load or less
  • Voltage display: ±3% ±3 digits ±0.5% of rated voltage
  • Short circuit current: 1.5 mA nominal test current
  • Test current on load: 1 mA at min pass values of insulation

Measurement accuracy

  • 1000V: 10kΩ ~ 999MΩ ±3% ±2 digits
  • 500V: 10kΩ ~ 500MΩ ±3% ±2 digits, >500MΩ ±10% ±4 digits
  • 250V: 10kΩ ~ 250MΩ ±3% ±2 digits, >250MΩ ±10% ±4 digits

Continuity / resistance

  • 0.01Ω ~ 99.9Ω: ±2% ±2 digits
  • 100Ω ~ 99.9kΩ: ±5% ±2 digits
  • Open circuit voltage: 5V ±1V
  • Test current(0Ω ~ 2Ω): 205mA ±5mA, 15mA ±5mA(user selectable)

Loop test

  • Live to earth supply: 48V ~ 280V (45Hz ~ 65Hz)
  • Live to live supply: 48V ~ 480V (45Hz ~ 65Hz)
  • L-E tests: ±5% 0.05Ω ±Noise margin
  • L-N/L-E tests: ±5% ±0.03Ω
  • Display range: 0.01Ω ~ 1000Ω
  • Live to earth PFC range: 20kA
  • Live to live PSCC range: 20kA

RCD tests

  • Supply up to 100mA: 48V ~ 480V (45Hz ~ 65Hz)
  • Supply up to 1A: 48V ~ 280V
  • RCD type: Type AC, A, S
  • No trip test (1/2xI): –10% ~ 0%
  • Trip test (1xI, 2xI & 5xI): 0% ~ 10%

RCD Ramp test

  • Touch voltage (0 ~ 253V): +5% +15% ±0.5V
  • Trip time: ±1% ±1ms
  • Trip current: ±5%

VAR (variable RCD selection)

  • 10mA ~ 50mA, 1mA steps.
  • 50mA ~ 500mA, 5mA steps
  • 500mA ~ 1000mA, 10mA steps

Supply measurement

  • Voltage: 10V ~ 600V (15 ~ 400Hz), ±3% ± 1V ±2 digits
  • Phase rotation indication: L1–L2–L3 & L1–L3–L2
  • Frequency: 15Hz ~ 99Hz ±0.5% ±1 digit, 100Hz ~ 400Hz ±2.0% ±2 digit
  • Frequency resolution: 0.1Hz

Current (via optional clamp meter)

  • Range: 0.1mA to 200A AC
  • Resolution: 0.1mA


  • IEC 61010-1:2010
  • IEC 61010-30:2010
  • IEC 61010-031:2008
  • 600 V Cat III / 300 V Cat IV (Max Phase to Phase 600 V)
  • IEC 61557:2007 parts 1 to 10
  • IEC61326 edition 2 location class B
  • Temperature (operational): -10°C ~ 55°C
  • Temperature (storage): -25°C ~ 70°C
  • Operating humidity: 90% R.H. at 40°C max
  • Max altitude: 2000m
  • Weight: 1kg
  • Moisture/dust ingress protection: IP54
  • Power: IEC LR6 type AA alkaline (6 cells - supplied)