Insulation & Continuity Testers

Range of insulation and continuity testing instruments including Megger insulation testers, insulation resistance testers, Fluke testers and insulation meters from Amprobe, DiLog, Seaward, Metrel, Martindale, Kewtech, Extech and more. Read More about Insulation & Continuity Testers
Filters
54 Products
  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
    5 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. Beha-Amprobe 9072-D Ohmtest Continuity Tester
    Beha-Amprobe logo
    Beha-Amprobe 9072-D Ohmtest Continuity Tester
    (no reviews)
    £48.36 £40.30
    • Continuity tester with a buzzer and optical display
    • Voltage proof up to 600V
    • Test resistance, semi-conductors, polarity, light-bulbs, and fuses
    40 Reward Points
    Price Match Guarantee
    3454373
  5. Martindale TEK404 Audible & Visual Continuity Tester
    Martindale logo
    Only 1 In Stock
    Martindale TEK404 Audible & Visual Continuity Tester
    (2)
    £51.00 £42.50
    • Audible and visual indicators
    • Safety measure included
    • Test leads and battery included in kit
    42 Reward Points
    Price Match Guarantee
    MARTEK404
  6. 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
  7. Extech MG310 Digital Insulation Tester
    Extech logo
    Extech MG310 Digital Insulation Tester
    (no reviews)
    £166.80 £139.00
    • Compact and lightweight with included protective cover
    • Insulation resistance measurements up to 5.5GΩ
    • Also tests polarisation index and dielectric absorption ratio
    139 Reward Points
    Price Match Guarantee
    MG310
  8. Extech 380320 Analogue Insulation Tester
    Extech logo
    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
  9. UNI-T UT505A Handheld Insulation Resistance Tester
    UNI-T logo
    Only 1 In Stock
    UNI-T UT505A Handheld Insulation Resistance Tester
    (no reviews)
    £190.80 £159.00
    • Measure insulation resistance to 20.0GΩ
    • Selectable test voltages to 1000V
    • AC/DC voltage measurements to 600V
    159 Reward Points
    Price Match Guarantee
    UT505A
  10. Sofamel CIT-10 Digital Insulation Tester
    Sofamel logo
    Sofamel CIT-10 Digital Insulation Tester
    (no reviews)
    £210.00 £175.00
    • 0.01 MΩ - 10.00 GΩ resistance range
    • Data storage
    • Automatic power off
    175 Reward Points
    Price Match Guarantee
    CIT-10
  11. 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
  12. Extech 380363 Digital High Voltage Insulation Tester
    Extech logo
    Lead Time: 1-2 Weeks
    Extech 380363 Digital High Voltage Insulation Tester
    (no reviews)
    £254.28 £211.90
    • Detects test voltage and conducts resistances tests
    • Live circuit warning system
    • Measures AC/DC voltage up to 999V
    211 Reward Points
    Price Match Guarantee
    380363
  13. Extech MG320 Insulation Tester and True RMS Digital Multimeter
    Extech logo
    Lead Time: 1-2 Weeks
    Extech MG320 Insulation Tester and True RMS Digital Multimeter
    (no reviews)
    £261.60 £218.00
    • Combined insulaition tester and digital multimeter
    • Insulation resistance to 20GΩ
    • AC/DC voltage, resistance and continuity functions
    218 Reward Points
    Price Match Guarantee
    MG320
  14. Robin Amprobe KMP7036 Insulation Tester
    Robin-Amprobe logo
    Lead Time: 2-3 Weeks
    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
  15. UNI-T UT513A Insulation Resistance Tester
    UNI-T logo
    Only 1 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
  16. 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
  17. 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
  18. DiLog DL9050N Digital Insulation/Continuity Tester
    DiLog logo
    Lead Time: 1-6 Days
    Free UK Delivery
    DiLog DL9050N Digital Insulation/Continuity Tester
    (no reviews)
    £354.00 £295.00
    • A hand held tester designed to perform insulation and continuity tests
    • Four test voltage ranges: 125, 200, 500, 1000V
    • Measurement ranges from 0.01Ω to 4GΩ
    295 Reward Points
    Price Match Guarantee
    DL9050N
  19. 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
  20. Kewtech KT300DL Digital Insulation/ Continuity Tester
    Kewtech logo
    4 In Stock
    Free UK Delivery
    Kewtech KT300DL Digital Insulation/ Continuity Tester
    (no reviews)
    £378.00 £315.00
    • 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
    315 Reward Points
    Price Match Guarantee
    KT300
  21. 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
  22. Megger MIT310 Insulation and Continuity Tester
    Megger logo
    In Stock
    Free UK Delivery
    Megger MIT310 Insulation and Continuity Tester
    (1)
    £414.00 £345.00
    • Specifically designed by electricians to deliver optimum performance
    • Automatic power down functionality to preserve battery life
    • Durable and robust design
    345 Reward Points
    Price Match Guarantee
    MEGIT2
  23. 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
  24. Megger MIT230 Insulation & Continuity Tester with Rubber Boot
    Megger logo
    Free UK Delivery
    Megger MIT230 Insulation & Continuity Tester with Rubber Boot
    (no reviews)
    £448.80 £374.00
    • Measure insulation resistance up to 1000 MΩ using 250V, 500V and 1000 V test voltages
    • Measure continuity between 0.01Ω and 100Ω
    • Integrated voltmeter and automatic test halting when a voltage of 50V or above is detected
    374 Reward Points
    Price Match Guarantee
    MIT230HD-EN

Showing 1 - 24 of 54 products

Page
Shop By:
Price
£ to
Availability
Manufacturer
13 10 6 6 4 3 2 2 1 1

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:

  • Design testing
  • Production testing
  • Acceptance testing
  • Verification testing
  • Preventive maintenance testing
  • Fault locating testing

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.