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Megger MFT1731-BS Multifunction Tester


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Free Leads, Screwdrivers or Wander Lead

The Megger MFT1731 is the highest-specification model in Megger's multifunction tester series. Including all of the functionality of the MFT1711 and MFT1721, this tester also includes built-in memory storage for your testing results, plus Bluetooth connectivity for transferal to PC.*

With the Megger MFT1731, you'll be able to test absolutely every aspect of a low voltage electrical installation in commercial, domestic and industrial environments. The tester is packed full of measurement functions, including insulation with selectable test voltages, continuity/resistance, loop, leakage current, multiple RCD tests and - exclusive to this model - can also be used to test 2/3 pole earth or 3 pole ART/stakeless earth.

The MFT1731's intergated memory makes it an ideal instrument for larger installations where you'll be testing a wide variety of equipment. Measurements can be stored instantly to the tester's memory, with space for up to 1000 individual results.

You can expect Megger's typical robustness and reliability with this unit; it includes IP54 protection against dust/water damage, CAT IV safety rating and even has built-in protection to ensure your safety should you connect things up wrong.

If you're a professional electrical installer looking for your new multifunction tester, Megger's MFT1731 is the solution you've been looking for.

*Note: the software for this tester is NOT included as standard with the unit. If you're interested in a version with the software, please follow this link instead.

Megger MFT1731 Multifunction Tester Key Features

  • Fully downloadable multifunction tester with integrated memory storage (store up to 1000 results)
  • Bluetooth communication
  • Insulation testing with selectable test voltages of 100, 250, 500 and 1000V + test voltage display and adjustable buzzer threshold
  • Continuity/resistance test with 200mA and 15mA selection and adjustable buzzer threshold
  • Loop testing - 2/3 wire non-tripping, 2 wire high current, 2 wire phase to phase, PSCC and PFC and Max Zs display
  • Earth electrode test with 2 and 3 pole, 3 pole ART and stakeless methods available (requires optional accessory)
  • RCD tests - 1/2, 5 x I, 1, ramp and Auto
  • Suitable for use with multiple RCD types including AC, A, S, B (Pure DC) and programmable RCDs, plus 3-phase
  • True RMS voltage supply measurements
  • Leakage current measurements (requires optional clamp adaptor)
  • Phase rotation indication
  • Powered by fully rechargeable NiMH batteries
  • CAT IV 300V and CAT III 600V safety rated

What's Included?

  • Megger MFT1731-BS Multifunction Tester
  • Printed Quick Start Guide
  • Switched Probe
  • Full User Guide on CD
  • Calibration Certificate
  • Megger Neck Strap
  • 3 Wire Lead Set with Probes + Clips
  • Mains Plug Test Lead (BS1363)
  • AC Battery Charger
  • Large Soft Carrying Pouch

Optional Accessories

Interested in these extras? Give us a call directly quoting the part number and we'll be able to help you out with prices and availaibility!

Part numbers in bold.

  • 1000-631 - Megger Powersuite Lite Software (please note that this is manual-entry, you can't download from the tester directly)
  • 1001-975 - Fused 10A Test Lead Set (Red/Blue/Green) with Probes + Clips
  • 1000-215 - ETL30 Extension Test Lead (30m)
  • 1000-217 - ETL50 Extension Test Lead (50m)
  • 5280-332 - Cigar Lighter Adapter for Battery Charging in Vehicle
  • 1001-687 - SP5 Switched Probe (Silicone)
  • 1001-012 - ICLAMP Current Measurement Clamp
  • 1001-013 - VCLAMP Voltage Inducing Clamp, Calibration Check PCB and Lead
  • 1006-408 - Test and Carrying Pouch
  • 1007-463 - Large Soft Pouch with Extra Storage
  • 1001-810 - Electrode Kit

 Megger MFT1700 Series Comparison Chart

There are three models in the Megger MFT1700 series; the entry-level MFT1711, the mid-range MFT1721 and the advanced MFT1731.

This table outlines the difference between each product in the series.

Model Number  MFT1711MFT1721MFT1731
Insulation Testing -
100V Test Voltage
250, 500V Test Voltage
1000V Test Voltage
Test Voltage Display
Adjustable Buzzer Threshold -
Continuity and Resistance Testing      
200mA Test
15mA Test -
Adjustable Buzzer Threshold
Loop Testing      
2 and 3 Wire Non-Tripping; L-PE (50V to 280V)
2 Wire High Current; L-N (50V to 280V)
2 Wire Phase to Phase; L-L (50V to 500V) -
PSCC and PFC (20kA Max)
Max Zs Display
R1 + R2 Display - -
Touch Voltage Display on Faulty Earth
Earth Electrode Test      
2 and 3 Pole (Requires Optional Accessory) - -
3 Pole Art and Stakeless Method (Requires Optional Accessory) - -
RCD Tests      
1/2, 1, 5 x I and Ramp
Auto RCD Tests v
Type AC, A and S RCD Compatibility
Type B (Pure DC) RCD Compatibility -
Programmable RCD Compatibility
3-Phase RCD (No Earth) Compatibility -
30, 100, 300 and 500mA RCD Compatibility
10mA and 1000mA RCD Compatibility 10mA only
Additional Features      
Supply Measurements
True RMS
Leakage Current Measurements (Requires Optional Accessory) -
Phase Rotation -
Calibration Certificate Included
Rechargeable Batteries (with Charger Included) - -
SP5 Switched Probe Included -
Warranty Upgradeable to 3 Years (FREE)
On-Board Memory with Bluetooth Download - -
CAT IV 300V / CAT III 600V
Hard Moulded Case -
Soft Pouch with Additional Storage - -


Please find below a table of accessories available for the Megger MFT1731-BS Multifunction Tester. For further information, or to add an item listed below to an order, please contact our sales team.

Our SKU Megger's Part Number Product 
1006-408 1006-408 Test & Carry Pouch MFT1700 Series
1005-135 1005-135 Test Lead Set Silicon Red/Green/Blue Unfused
ICLAMP 1001-012 ICLAMP 1000A AC Current Clamp
VCLAMP 1001-013 VCLAMP Voltage Clamp
1010-518 1010-518 MVC1010 Voltage Clamp - CAT IV 600V rated
1010-516 1010-516 MCC1010 Current Clamp - CAT IV 600V rated
1011-275 1011-275 Replacement Lead for MCC1010 Clamp
1011-274 1011-274 Replacement Lead for MVC1010 Clamp
1001-811 1001-810 Earth Test Spike Kit
2007-998 2007-998 XTL50 Extended Test Lead (50 m)
2007-997 2007-997 XTL30 Extended Test Lead (30 m)
2001-649 1004-319 Blow Moulded Case MFT1700/MFT1800 Series
MEMGMTA4 1004-326 Instrument/Document Carry Case
MEGLOA20 1004-183 12V DC Car Battery Charger 2.5mm PIN
1007-003 1007-003 Blow Moulded Case Catch - Pack of 10
1002-735 1002-735 Battery NiMH (X6) - MFT17/18
MEGMTA33 1002-736 Charger Power Supply  - MFT1700/1800 Series
2001-509 1007-161 Carry Strap MFT1700/1800 Series
1007-463 1007-463 Large Soft Carry Case for all MFTs
1001-975 1001-975B Test Lead Set Red/Blue/Green Fused F10A 50kA (Boxed)  
1001-977 1001-977B Fused 10A test lead set (Red/Green) with Prods and clips right angle plugs F10A 50kA (Boxed)
MEGMTA1 1001-991B Test Lead Red/Green/Blue Unfused Red/Blue Lg Tip (Boxed)
MEGITA1 1002-001B Test lead Set - Comprising Two Unfused Leads (Red/Black) with right angle plugs, Long & Short prods & croc clips (Boxed)
MEGRCDA4 1002-015B Fused Test Lead Set Red/Black Red FF500mA 50kA (Boxed)
1002-490 1002-490B Red, Blue and Green Probes & Clips (MFT/LOOP) (Boxed)
1001-976 1003-132B Test Lead Set Red/Green Unfused (Boxed)  
6220-810 1004-323B SIA10 Socket Interface Adaptor UK to 3 Leads x 4mm (Boxed)
1002-774 1007-157B Remote Switched probe SP5 CAT IV 600 (Boxed)
2001-509 1007-161B Carry Strap MFT1700/1800 Series Accessory (Boxed)
MEGSW1 1000-631 Megger Powersuite Lite - 17th Edition and PAT Certification Software
MEGETA17 6210-160 Megger ETKIT3 Earth Test Kit - 3 Terminal
MTB7671 1002-224 MTB7671/2 Megger Test Box for Validating Installation Testers
Accessories related to this product:
  1. Megger 3 lead Red/Green/Blue Unfused Large Tip
    £45.60 £38.00
  2. Megger 1011-274 Replacement Lead for MVC1010 Voltage Clamp
    £44.40 £37.00
  3. Megger 1007-157B SP5 Switched Probe - Kit
    £64.80 £54.00
  4. Megger 2001-509 Carry Strap for MFT1700/1800 Series
    £9.90 £8.25
  5. Megger Fused 10A Test Leads (for LT/RCDT/LRCD Series Loop Testers)
    £56.40 £47.00
  6. Megger 1002-736 Charger Power Supply
    £28.80 £24.00
  7. Megger 1007-463 Large Soft Carry Case for all Megger's MFTs
    £44.03 £36.69
  8. IET Wiring Regulations 18th Edition: BS 7671:2018 Requirements for Electrical Installations - Front
    £75.90 £75.90
  9. CalCard Calibration Checkbox
  10. Megger Standard Test Leads
    £31.50 £26.25
  11. Megger 1011-275 Replacement Lead for MCC1010 Current Clamp
    £44.40 £37.00
  12. Megger 1005-135 Silicon Test Lead Set
    £50.39 £41.99
  13. Megger 6420-143 Soft Carrying Case - Clearance Stock
    Megger 1004-326 Soft Carrying Case
    Only 1 in Stock
    £47.70 £39.75
  14. Megger SIA10 Socket Interface Adaptor
    £31.50 £26.25
  15. Megger MTB7671 Calibration Test Box - Kit
    Megger MTB7671 Calibration Test Box
    Only 1 in Stock
    £372.00 £310.00
  16. Megger 1010-516 MCC1010 Current Clamp - Kit
    £336.00 £280.00
  17. Megger 1002-490 Red, Blue and Green Probes & Clips
    £35.10 £29.25
  18. Megger 1001-977 Two-Wire Test Lead Set - w/ Box
    £53.94 £44.95
  19. Megger Fused Test Leads (Red/Black)
    £63.00 £52.50
  20. Megger 1004-319 Hard Carrying Case
    £28.80 £24.00
  21. Megger 1006-408 Test and Carry Pouch - Front
    £44.40 £37.00
  22. Megger XTL30 Extended Test Lead
    £85.50 £71.25
  23. Megger Earth Test Kit (for MFT Series)
    Megger Earth Test Kit (for MFT Series)
    Lead Time: 1-2 Weeks
    £53.94 £44.95
  24. Megger PAT Certification Software
    £246.00 £205.00
  25. Megger 1010-518 MVC1010 Voltage Clamp
    £336.00 £280.00
  26. Megger 1002-735 NiMH Battery for MFT17/18
    £35.10 £29.25
  27. Silvertronic 3 Wire Silicone Test Lead Set
    £26.34 £21.95
  28. Megger Test Lead Set 2 Wire Lead Set
    £31.20 £26.00
  29. Megger 1004-183 12V DC Car Battery Charger
    £18.90 £15.75
  30. Megger 1007-003 Blow Moulded Case Catch
    £14.40 £12.00
  31. Megger XTL50 Extended Test Lead (50 m)
    £97.20 £81.00
  32. Megger ETKIT3 Earth Tester
    Megger ETKIT3 Earth Tester
    Only 1 in Stock
    £188.70 £157.25
Part Code1008-128

Megger MFT1711, MFT1721 and MFT1731 Technical Specifications

Please be aware that not all features are available for every model. If a feature is not included on a model, there will be a note next to each section.

Insulation Tests  
Output Voltage -0 to +20% at rated load or less
Voltage Display ±3% ±3 digits ±0.5% of rated voltage
Short Circuit Current 1.5mA nominal test current
Test Current on Load 1mA at min pass values of insulation
Insulation Accuracy  
1000V 10kΩ to 999MΩ (±3% ± 2 digits)
500V 10kΩ to 500MΩ (±3% ± 2 digits)
>500MΩ (±10% ± 4 digits)
250V 10kΩ to 250Ω (±3% ± 2 digits)
>250MΩ (±10% ± 4 digits)
100V 10kΩ to 100MΩ (±3% ± 2 digits)
>100MΩ (±10% ± 4 digits)
Resistance and Continuity  
Range and Accuracy 0.01 to 99.9Ω (±2% ± 2 digits)
100 to 99.9kΩ (±5% ± 2 digits)
Open Circuit Voltage 5V ± 1V
Test Current (0 to 2Ω) 205mA ±5mA
15mA ±5mA (user selectable)
Loop Test  
Live to Earth/Neutral Supply 48 to 280V (45 to 65Hz)
Live to Live Supply (Not Available on MFT1711) 48 to 500V (45 to 65Hz)
L-N/L-L Tests ±5% ±5 digits
L-E Tests 0.1 to 39.9Ω (±5% ±5 digits ± noise margin)
40Ω to 1000Ω (±10% ± 5 digits)
Display Range 0.01 to 1000Ω
Live to Earth PFC Range 20kA
Live to Live PSCC Range 20kA
RCD Tests  
Supply up to 100mA 48 to 480V (45 to 65Hz)
Supply up to 1A 48V to 280V
RCD Type Type AC, A and S
Type B (Pure DC)
No-Trip Test (1/2xI) -10 to -0%
Trip Test (1xI, 2xI and 5xI) +0 to +10%
Ramp Test Touch Voltage (0 to 253V) ±5% +15% ±0.5V
Trip Time ±1% ±1ms
Trip Current ±5%
Step Increments  
VAR (Variable RCD Selection)  
10mA to 50mA 1mA steps
50mA to 500mA 5mA steps
500mA to 1000mA 10mA steps
Supply Measurement  
Voltage 10V to 600V (15 to 400Hz) True RMS
Voltage Accuracy ±3% ±1V ±2 digits
Phase Rotation Indication L1-L2-L3 and L1-L3-L2
Frequency 15Hz to 99Hz (±0.5% ±1 digit)
Frequency Resolution 0.1Hz
Power Supply  
MFT1711 and MFT1721 IEC LR6 type AA alkaline batteries
MFT1731 1.2V NiMH Rechargeable Batteries
Mains charger for on-board recharging (4 hours typical)
12V optional car charger available
Earth/Ground Test (MFT1731 Only)  
Resolution 0.01Ω
Current 0.45mA or 4.5mA
Noise Rejection 20V pk/pk (7V rms)
Max Probe Resistance (Rp and RC) 100kΩ @ 50V
5kΩ at 25V
2 and 3 Pole Method 0.01 to 1.999kΩ (±2.0% ± 3 digits)
ART method (1.00Ω to 1.999kΩ) with accuracy of ±5.0% ± 3 digits
Stakeless Method 1.00 to 199Ω (±7.0% ± 3 digits)
Current (Via Optional Clamp Meter)  
Range 0.1mA to 200A AC (5.0% ± 3 digits)
Resolution 0.1mA
MV Sensor Input (MFT1721 and MFT1731)  
Including Temperature 0.0mV to ±199.9mV DC (±1.0% ± 2 digits)
Resolution 0.1mV
Data Storage (MFT1731 Only)  
Capacity 1000 results
Communication Bluetooth
IEC 61010-1: 2010
IEC 61010-30: 2010
IEC 61010-031: 2008
600V CAT III / CAT IV 300V (Max phase to phase 600V)
IEC 61557: 2007 parts 1 to 10
EMC IEC61326 edition 2 location class B
Operating Temperature Range and Humidity -10 to +55°C (90% RH at +40°C max)
Storage Temperature Range and Humidity -25 to +70°C
Maximum Altitude 2000m
Weight (Instrument and Case) 1kg (with batteries)
Dimensions (Instrument and Case) - MFT1711 and MFT1721 150mm x 85 x 235mm (H x W x D)
Dimensions (Instrument and Case) - MFT1731 220 x 390 x 285mm (H x W x D)
IP Rating IP54
Calibration Temperature +20°C
Temperature Coefficient <0.1% per °C
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