Insulation & Continuity Testers

  1. Vermason ESD High-Speed High-Accuracy Wrist Strap Tester
    PASS logo
    In Stock
    Vermason ESD High-Speed High-Accuracy Wrist Strap Tester
    (no reviews)
    £8.84 £7.37
    • 1-second test cycle
    • 24V DC test voltage
    • PASS/ FAIL indication
    7 Reward Points
    Price Match Guarantee
    VER-2529067
  2. Extech CT20 Remote & Local Continuity Tester
    Extech logo
    3 In Stock
    Extech CT20 Remote & Local Continuity Tester
    (2)
    £28.68 £23.90
    • Easy and quick local/remote continuity verification
    • Lightweight for hands-free attachment to wires
    • Bright flashing LED indicators and remote test probe
    23 Reward Points
    Price Match Guarantee
    CT20
  3. Martindale TEK402 Continuity Tester with Audible Indication
    Martindale logo
    Only 1 In Stock
    Martindale TEK402 Continuity Tester with Audible Indication
    (no reviews)
    £41.40 £34.50
    • Built in continuity buzzer
    • Tough outside casing
    • Tests for voltage and current
    34 Reward Points
    Price Match Guarantee
    MARTEK402
  4. Martindale TEK404 Audible & Visual Continuity Tester
    Martindale logo
    Only 1 In Stock
    Martindale TEK404 Audible & Visual Continuity Tester
    (2)
    £50.40 £42.00
    • Audible and visual indicators
    • Safety measure included
    • Test leads and battery included in kit
    42 Reward Points
    Price Match Guarantee
    MARTEK404
  5. UNI-T UT501A Insulation Resistance Tester
    UNI-T logo
    In Stock
    UNI-T UT501A Insulation Resistance Tester
    (no reviews)
    £138.00 £115.00
    • Simple dial and push-button interface
    • Large LCD screen
    • Four jacks for testing
    115 Reward Points
    Price Match Guarantee
    UT501A
  6. Extech 380320 Analogue Insulation Tester
    Extech logo
    2 In Stock
    Extech 380320 Analogue Insulation Tester
    (no reviews)
    £186.00 £155.00
    • Tests for both insulation and voltage
    • New Lock Power On function
    • Also detects and measures continuity, resistance and AC voltage
    155 Reward Points
    Price Match Guarantee
    380320
  7. Extech 380260 Autoranging Digital Megohmmeter
    Extech logo
    Only 1 In Stock
    Extech 380260 Autoranging Digital Megohmmeter
    (no reviews)
    £218.40 £182.00
    • Conducts insulation tests and voltage detection
    • Hands free operation possible with lock power on
    • Super large backlit dual display
    182 Reward Points
    Price Match Guarantee
    380260
  8. Robin Amprobe KMP7036 Insulation Tester
    Robin-Amprobe logo
    Only 1 In Stock
    Free UK Delivery
    Robin Amprobe KMP7036 Insulation Tester
    (no reviews)
    £306.00 £255.00
    • 250V, 500V and 1000V ranges
    • Tests insulation of transformers, motors, cables and wires
    • Optimised to preserve user and instrument safety
    255 Reward Points
    Price Match Guarantee
    3730274
  9. UNI-T UT513A Insulation Resistance Tester
    UNI-T logo
    2 In Stock
    Free UK Delivery
    UNI-T UT513A Insulation Resistance Tester
    (1)
    £322.80 £269.00
    • High spec insulation resistance tester
    • Autoranging
    • Bright backlit screen
    269 Reward Points
    Price Match Guarantee
    UT513A
  10. Socket & See IRC PRO Insulation and Continuity Tester
    Socket and See logo
    Only 1 In Stock
    Free UK Delivery
    Socket & See IRC PRO Insulation and Continuity Tester
    (no reviews)
    £322.80 £269.00
    • Conduct insulation tests at 1000V, 500V and 250V
    • Buzzer function for ‘belling out’
    • Hands-Free function
    269 Reward Points
    Price Match Guarantee
    IRCPRO
  11. Megger MIT220 Insulation and Continuity Tester
    Megger logo
    In Stock
    Free UK Delivery
    Megger MIT220 Insulation and Continuity Tester
    (1)
    £352.80 £294.00
    • Lightweight
    • Test up to 500V
    • Easy-to-use interface
    294 Reward Points
    Price Match Guarantee
    MEGIT8
  12. Chauvin Arnoux CA6511 Megohmmeter Analogue with Rubber Boot & Leads
    Chauvin Arnoux logo
    Only 1 In Stock
    Free UK Delivery
    Chauvin Arnoux CA6511 Megohmmeter Analogue with Rubber Boot & Leads
    (no reviews)
    £370.80 £309.00
    • Measures insulation as high as 1000Mohm
    • Also tests for voltage and continuity
    • Automatic testing for voltage
    309 Reward Points
    Price Match Guarantee
    P01140201
  13. Fluke 1503 Insulation Tester
    Fluke logo
    In Stock
    Free UK Delivery
    Fluke 1503 Insulation Tester
    (2)
    £400.80 £334.00
    • Insulation resistance measurements up to 20MΩ
    • Voltage and earth resistance measurements
    • 500V and 1000V test voltages

    334 Reward Points
    Price Match Guarantee
    FLUIT1
  14. Megger MIT230 Insulation and Continuity Tester
    Megger logo
    In Stock
    Free UK Delivery
    Megger MIT230 Insulation and Continuity Tester
    (no reviews)
    £436.80 £364.00
    • 250V, 500V and 1000V testing capability
    • Audible buzzer notifications
    • Insulation testing up to 100mOhm
    364 Reward Points
    Price Match Guarantee
    MEGIT9
  15. Megger MIT310 Insulation and Continuity Tester
    Megger logo
    In Stock
    Free UK Delivery
    Megger MIT310 Insulation and Continuity Tester
    (1)
    £453.60 £378.00
    • Specifically designed by electricians to deliver optimum performance
    • Automatic power down functionality to preserve battery life
    • Durable and robust design
    378 Reward Points
    Price Match Guarantee
    MEGIT2
  16. Megger MIT300 Insulation and Continuity Tester
    Megger logo
    4 In Stock
    Free UK Delivery
    Megger MIT300 Insulation and Continuity Tester
    (1)
    £462.00 £385.00
    • Small and portable for testing on the go
    • Selectable measurements using easy-to-use dial
    • Locking capability when not in use
    385 Reward Points
    Price Match Guarantee
    MEGIT1
  17. Kewtech KT300DL Digital Insulation/ Continuity Tester
    Kewtech logo
    4 In Stock
    Free UK Delivery
    Kewtech KT300DL Digital Insulation/ Continuity Tester
    (no reviews)
    £466.80 £389.00
    • Ergonomic, easy-to-use, accurate, 18th Edition single-function tester
    • Run insulation tests at 50V, 100V, 250V, 500V and 1000V
    • Determine breakdown voltage and conduct continuity tests with an audible alert
    389 Reward Points
    Price Match Guarantee
    KT300
  18. Megger MIT400/2 Insulation Tester
    Megger logo
    In Stock
    Free UK Delivery
    Megger MIT400/2 Insulation Tester
    (no reviews)
    £498.00 £415.00
    • Measure insulation with test voltages of 250, 500 an 1000V
    • Also tests continuity and voltage
    • Handheld, portable design
    415 Reward Points
    Price Match Guarantee
    1004-731
  19. Fluke 1507 Insulation Tester
    Fluke logo
    In Stock
    Free UK Delivery
    Fluke 1507 Insulation Tester
    (1)
    £522.00 £435.00
    • Perform repetitive tests using the 'Compare' feature
    • Ships with remote test probe, test leads and alligator clips
    • Battery lasts for up to 1000 high voltage tests
    435 Reward Points
    Price Match Guarantee
    FLUIT2
  20. Megger MIT320 Insulation and Continuity Tester
    Megger logo
    5 In Stock
    Free UK Delivery
    Megger MIT320 Insulation and Continuity Tester
    (1)
    £580.80 £484.00
    • Powerful insulation and continuity tester in a handheld, weatherproof case
    • Upgraded version of the MIT310 with more measurement functions
    • Safety features keep you protected when testing in dangerous situations
    484 Reward Points
    Price Match Guarantee
    MEGIT4
  21. Megger MIT410/2 Insulation Tester
    Megger logo
    4 In Stock
    Free UK Delivery
    Megger MIT410/2 Insulation Tester
    (no reviews)
    £582.00 £485.00
    • Upgraded version of Megger's MIT400/2
    • Test voltages from 50 to 1000V
    • Test continuity, voltage, frequency, PI and DAR
    485 Reward Points
    Price Match Guarantee
    1004-735
  22. Megger MIT415/2 Insulation Tester
    Megger logo
    2 In Stock
    Free UK Delivery
    Megger MIT415/2 Insulation Tester
    (no reviews)
    £622.80 £519.00
    • Insulation measurements up to 100GΩ
    • Portable, handheld design with IP54 protection
    • Six selectable test voltages
    519 Reward Points
    Price Match Guarantee
    1006-738
  23. Megger MIT330 Insulation and Continuity Tester
    Megger logo
    3 In Stock
    Free UK Delivery
    Megger MIT330 Insulation and Continuity Tester
    (no reviews)
    £628.80 £524.00
    • Most advanced model in MIT300 series
    • Selectable voltage range
    • Also tests continuity, resistance and voltage
    524 Reward Points
    Price Match Guarantee
    MEGIT5
  24. Megger MIT420/2 Insulation Tester with Memory
    Megger logo
    In Stock
    Free UK Delivery
    Megger MIT420/2 Insulation Tester with Memory
    (no reviews)
    £657.60 £548.00
    • Upgraded version of the MIT410/2 with memory storage
    • Variable test voltage up to 1000V
    • Handheld, portable design with built-in stand
    548 Reward Points
    Price Match Guarantee
    1004-739

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About Insulation & Continuity Testers

Insulation is a vital part of any electrical system. Correctly installed insulation ensures that the current flowing through a system remains on the designated path it should be moving through and breakdowns in the overall insulation of a system can cause leakage current to flow, leading to problems and potential hazards.

The overall insulation of any system is susceptible to degradation over some time. As standard, the insulation of an electrical system or appliance should be solid enough to constrain as much leakage current as possible until the overall level is completely negligible, but many outside factors can affect the overall insulation over some time, thus increasing the risk of higher levels of leakage current.

Parameters that can affect the overall amount of insulation present in a system vary greatly; everything from cuts in wiring, vibrations, pollution (corrosive materials), and even dust and dirt in the air can gradually erode at insulative properties, effectively rendering them less useful over time.

Insulation test equipment is designed to effectively measure the level of insulation left on an electrical system. Knowing the overall level of insulation allows the tester to determine whether the insulation is still safe for use, or whether steps have to be taken immediately to make sure that the insulation is repaired to an acceptable level.

Common insulation testers are generally used to perform two different forms of electrical measurements. These measurements are obtained by testing between the conductors that carry current when energized and other parts of the system in which no current should ever flow under normal operating conditions. To gain an overall reading of the level of insulation resistance present two things must be measured: the actual leakage current flowing through the installation, and to measure the actual resistance of the insulation.

Insulation is also commonly measured to verify quality control of manufactured electrical devices, ensure electrical devices meet codes and standards (safety compliance), determine a device's performance over time (preventive maintenance), and determine causes of failure in troubleshooting scenarios. You can further classify insulation resistance testing into different testing types. These are:

The actual type of insulation resistance tester needed to be used also varies on an application-by-application basis. Although standard ohmmeters commonly found on devices such as multimeters can be used to measure insulation, these generally do not have the measurement range required to determine insulation effectively.

Two main instruments are used to measure insulation resistance - the first is the megohmmeter, a tester that's the same as a standard ohmmeter but has a higher measurement range to accommodate the needs of insulation. The second tester is known as a hipot tester, and these instruments measure insulation resistance by measuring leakage current. Hipot testers apply a high test voltage between two different conductors or between a conductor and ground and measure the leakage current. An excessive amount of leakage current (in apms) indicates a lower resistance or breakdown in insulation. Hipot tests almost always involve applying a test voltage that is several times higher than the specified operating voltage of the cable or device being tested.

Continuity Testing

Continuity testers are used to test for a complete flow path (open, broken, or closed) in any de-energized low-resistance application. They tie in with insulation testers, as broken continuity of a flow path generally means that current is being lost somewhere, which may be the result of a break in insulation levels.

This type of tester is often integrated into an insulation testing device, allowing users to carry out both testing types without the need to switch instruments. If you do prefer to operate with separate instruments both insulation and continuity testing devices are available as separate products as well.

Continuity testers can also contain integrated voltage measurement capability using two-pole probes.

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