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Megger MFT1721-BS Multifunction Tester

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Test even more with Megger's MFT1721, the upgraded version of Megger's MFT1711!

The mid-range model in the series, the new inclusions are 100V insulation testing, true RMS voltage measurements, mV sensor input and type B RCD compatibility. The tester is fully suitable for use in all low voltage electrical installations, including those found in domestic, commercial and industrial environments.

Megger's MFT1721 is the next-generation version of the highly popular mid-range tester, the MFT1720. It features a large, bright LCD display which shows dual parameters (loop resistance/fault current or insulation resistance/test voltage) and dual-testing buttons on either side for easy test activation.

You can work confidently and safely with the MFT1721; this tester include IP54 protection against dust and water damage, a rubber-moulded grip for extra protection and easier holding and is EN 61010 CAT IV safety rated. It also comes with class-leading input protection to ensure it can withstand accidental misconnections or voltage transients which may damage other testers without this capability.

The MFT1721 is packed full of testing functions including insulation with selectable test voltage, continuity and resistance testing at 200mA and 15mA, several loop testing functions, multiple RCD tests on AC, A, S, type B and programmable RCDs and other features such as phase rotation indication and leakage current measurements.

Megger MFT1721-BS Multifunction Tester Key Features

  • Insulation tests at 100V (NEW), 250, 500 and 1000V with input protection against live circuits up to 600V
  • Continuity resistance tests at 200mA or 15mA
  • Automatic start - no need to press the test button, leaving both hands free to hold probes
  • Resistance range up to 100kΩ with fast continuity buzzer at selectable thresholds
  • Earth loop testing with 3 and 3 wire non-trip range and 2 wire High current (including phase to phase)
  • Prosepective fault current measurements up to 20kA
  • RCD tests on AC, A, S, B (NEW) and programmable RCDs
  • Automatic RCD testing
  • 1/2, 1, 5 x I and ramp RCD testing
  • Supply measurements
  • True RMS for added accuracy when testing on irregular waveforms (NEW)
  • Leakage current measurements
  • mV sensor input (NEW)
  • Phase rotation indication
  • CAT IV 300V and CAT III 600V safety rated

What's Included?

  • Megger MFT1721-BS Multifunction Tester
  • Full User Guide on CD
  • Calibration Certificate
  • SP5 Switched Probe
  • Neck Strap
  • 3 Wire Lead Set + Probes and Clips
  • Mains Plug Test Lead (BS1363)

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)
  • 2000-674 - Euro Mains Test Lead SIA45 (not AU)
  • 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

 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.

Why not consider upgrading to the MFT1731? This model includes everything on the MFT1721 plus downloadable memory and earth testing functions!

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

Model Number MFT1711 MFT1721 MFT1731
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 - -


There are a number of additional accessories available for the Megger MFT1721-BS Multifunction Tester; please see the table below for details. For further information please contact our sales team prior to purchase. 

Our Stock Code Megger's Part Number  Product
1006-408 1006-408 Test & Carry Pouch MFT1700 Series
1005-135 1005-135 Unfused Lead Set Si Red/Blue/Green
ICLAMP 1001-012 ICLAMP Current Clamp
VCLAMP 1001-013 VCLAMP Voltage Clamp
1010-518 1010-518 MVC1010 Voltage Clamp
1010-516 1010-516 MCC1010 Current Clamp
1011-275 1011-275 MCC1010 Lead Accessory
1011-274 1011-274 MVC1010 Lead Accessory
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 MFT17/1800   
MEGMTA4 1004-326 Instrument/Document carry case
MEGLOA20 1004-183 DC Car Charger 2.5mm Pin
1007-003 1007-003 Case Catch - Pack of 10  
1002-735 1002-735 Battery NiMH (X6) - MFT17/18
1007-463 1007-463 MFT Carry Case - Large
1001-975 1001-975B Fused LeadSet B,R,G F10A 50kAb (Boxed)
1001-977 1001-977B Fused Lead Set Red Green F10A 50kA (Boxed)
MEGMTA1 1001-991B Unfused Lead R/G/B, R/B LgTip (Boxed)
MEGITA1 1002-001B Unfused Lead Set, Red/Black (Boxed)
MEGRCDA4 1002-015B Fused Lead Set, Red/Black (Boxed)
1002-490 1002-490B Prod & Clip Set- MFT/LOOP Boxed
1001-976 1003-132B Unfused Lead Set Red, Green (Boxed)
6220-810 1004-323B SIA10 Interface Adaptor UK 3-Lead(Boxed)
1002-774 1007-157B SP5 Remote Switched Probe (Boxed)
2001-509 1007-161B Carry Strap MFT17/18 Accessory
MEGSW1 1000-631 Megger Powersuite Lite - 17th Edition and PAT Certification Software
MTB7671 1002-224 MTB7671/2 Megger Test Box
Please note that the accessories listed above and the datasheets attached are subject to change. Both were correct at the time of publication.

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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Additional Information
SKU 1008-123
Manufacturer Part Code 1008-123

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