Megger MFT1721 Multifunction Tester

98% of 100



  • Suitable for single and 3 phase installation testing
  • Patented 2 wire anti-trip loop test
  • Tests 3 phase and Type B RCD's
  • Robust and reliable
  • Availability: IN STOCK
More Information
Warranty 3 years
Price Match Yes
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Megger MFT1721 Multifunction Tester

The Megger MFT1721 is a mid-range 18th edition multifunction tester from Megger, suitable for testing single and three phase installations found in domestic, industrial and commercial environments.

Every Megger Multifunction Tester is built to last, it won’t go bang when dropped, bounced, left out in the rain, connected across phases or even locked on and connected to a live circuit. This tough reputation is topped off with a 3 year warranty (with product registration) for complete peace of mind.

Each Megger MFT also has a Z max function, ensuring testing final ring circuits is quick and easy.

Adding to the already impressive feature set of the Megger MFT1711, the MFT1721 includes the following additional popular features…

  • 100V insulation test range
  • 15mA continuity test
  • 2 Wire Phase to Phase L-L 50 V ~ 500 V loop test
  • R1 + R2 value
  • 3 Phase RCD (no earth)
  • 1000mA RCD test
  • Phase rotation
  • Type B (pure DC) RCDs
  • SP5 switch probe for remote testing

These additional features are often considered as ‘future proofing’ simply as it reduces the chance of coming across part of an installation a user is unable to test. For example a 100V insulation range and 15mA continuity test are ideal for use on inductive loads or simply to save power. Whilst type B RCD testing is useful for solar PV installations and vehicle charging points.

Megger MFT1721 Measurements

Voltage measurements: True RMS for more reliable voltage readings even on noisy circuits.

Insulation testing: Selectable test ranges 100V / 250V / 500V or 1kV. The Megger 1721 is also fully protected against live circuits.

RCD: Ability to test 10 / 30 / 100 / 300 / 500 and 1000mA RCD’s at ½, 1 and 5 times. Auto test feature to save you time by not having to return to the tester when the RCD trips. Ramp test to determine at what current the RCD actually trips. Also tests Type B (pure DC) RCDs and 3 phase RCD (no earth).

Continuity and resistance: 200mA and 15mA test ranges with adjustable buzzer threshold.

Loop testing

  • 2 and 3 Wire Non-Tripping L-PE 50 V ~ 280 V
  • 2 Wire Hi Current L-N 50 V ~ 280 V
  • 2 Wire Phase to Phase L-L 50 V ~ 500 V
  • PSCC and PFC (20 kA max.)
  • Max. Zs Display
  • R1 + R2 Value

The Megger 1721 has been designed to be as simple and comfortable to use for long periods of time. A TEST button features on both the right and left hand side, along with a large, central back lit screen. The 1721 is also a light weight tester at only 1kg when the batteries are fitted. A neck strap is also included.

  MFT1711 MFT1721 MFT1731 MFT1741
Earth Loop Impedance ranges Coventional 3-wire no-trip test L-PE  
  New algorithm 3-wire no-trip test L-PE      
  Confidence meter      
  Tests through 10 mA RCDs      
  Tests through 30 mA RCDs
  L-N/L-E 48V to 280V, 45 Hz to 65 Hz
  L-N/L-E 48V to 480V, 45 Hz to 65 Hz  
Insulation resistance range 250V, 500V and 1kV test voltages
  100V test voltage  
  Adjustable buzzer threshold  
Continuity and resistance range 200mA test current for certification
  15mA test current to prolong battery life  
  Auto start continuity test
Voltage, Frequency and phase rotation range 10V to 600V AC and DC
  Frequency 15Hz to 400Hz
  Phase Rotation  
RCD testing range 10, 30, 100, 300, 500mA RCDs
  1000mA RCDs  
  High Speed auto RCD test
  Ramp test for RCD fault finding
  Type A, type AC and Type S RCDs
  Programmable RCDs
  Type B RCDs  
  3 phase (no earth) RCDs  
Earth electrode resistance range Stakeless or clamp on testing**    
  3-wire testing for fall of potential or 62% rule    
  Attached rod technique 3-pole testing    
  Option of 25V and 50V output    
  Ground noise check    
Additional benefits Probe Incorporatin test button    
  Current measurement 0.1mA to 200A *    
  On-board recharging    
  On-board memory    
  Bluetooth downloading from memory or blobbing    
  Hard plastic carry case    
  Large soft carry case    

*Requires optional iClamp **Requires optional i and vClamp

Test4less 'Bolt On Kit's' include a range of useful accessories and offer a guaranteed saving against buying separately. 

 MFT1721 Kit Variants
Bolt On Kit 1 Bolt On Kit 2 Bolt On Kit 3
Socket & See SOK22 Craftsman Socket Tester    
Socket & See iVolt Voltage Detector
Testmate Personal Lockout Tagout Kit 1
Socket & See FFCB200 UK Easy Fuse Finder  
Socket & See DCF200 Dead Circuit Finder  
Socket & See SOK32 Craftsman Socket Tester    
Socket & See FFCB1140 UK Dual Voltage Fuse Finder Kit     ● 
Socket & See SOK34 Easy Socket and Earth Loop Tester     ● 
Socket & See CB400 Non-Trip 18th Edition Calibration Checkbox      ● 

What's Included?

  • Megger MFT1721 Multifunction Tester 
  • 3 wire test lead set with probes and crocodile clips
  • Mains plug test lead
  • Batteries
  • Switched test probe for remote testing
  • Megger embroidered Neck strap
  • Carry case
  • Full user guide CD for MFT 1721
  • Megger calibration certificate
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