Calibration Checkboxes

Calibration checkboxes, or electrical checkboxes, are used for routine observations of test equipment and allow users to maintain accuracy in between official calibration procedures. Suitable for use with PAT testers and with other testers and instruments. Read More about Calibration Checkboxes
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12 Products
  1. Megger Record Card Set with Test Labels
    Megger logo
    Lead Time: 1-2 Weeks
    Megger Record Card Set with Test Labels
    (no reviews)
    £30.00 £25.00
    • Record Card Set
    • Test Labels
    • Suitable for Megger's MTB7671/2 Test Box
    25 Reward Points
    Price Match Guarantee
    2002-524
  2. Megger DET Calibration Checker, 25 Ohm
    Megger logo
    Megger DET Calibration Checker, 25 Ohm
    (no reviews)
    £93.60 £78.00
    • DET Calibration Checker
    • 25 ohm
    • Suitable for DET3T and DET4T
    78 Reward Points
    Price Match Guarantee
    1000-435
  3. Megger 1000-434 Dual Calibration Checker
    Megger logo
    Lead Time: 1-2 Weeks
    Megger 1000-434 Dual Calibration Checker
    (no reviews)
    £93.60 £78.00
    • Dual Calibration Checker
    • Two-clamp measurements
    • Suitable for DET4T Series
    78 Reward Points
    Price Match Guarantee
    1000-434
  4. Kewtech FC2000 Calibration Checkbox
    Kewtech logo
    2 In Stock
    Kewtech FC2000 Calibration Checkbox
    (1)
    £178.80 £149.00
    • Built inside a protective carrying case
    • Multiple testing types
    • Suitable for use with all testers
    149 Reward Points
    Price Match Guarantee
    FC2000
  5. Seaward PAT Checkbox
    Seaward logo
    Only 1 In Stock
    Seaward PAT Checkbox
    (no reviews)
    £261.60 £218.00
    • Verify ongoing accuracy
    • Earth bond, insulation, flash test, and earth leakage
    • ±1% ± 1 digit
    218 Reward Points
    Price Match Guarantee
    SEAPTA12
  6. Megger MTB7671 Calibration Test Box
    Megger logo
    2 In Stock
    Free UK Delivery
    Megger MTB7671 Calibration Test Box
    (1)
    £477.60 £398.00
    • Essential for testing your equipment
    • Provides readings conforming to British Standards
    398 Reward Points
    Price Match Guarantee
    MTB7671
  7. Socket & See CB400 Non-Trip Installation Testing Calibration Checkbox
    Socket and See logo
    Lead Time: 1-6 Days
    Free UK Delivery
    Socket & See CB400 Non-Trip Installation Testing Calibration Checkbox
    (no reviews)
    £479.94 £399.95
    • Validate your instruments through regular self-calibration checks
    • Compliance to - BS EN 61557
    • Ensures accuracy 
    399 Reward Points
    Price Match Guarantee
    CB400
  8. Megger CB101 5 kV Calibration Box
    Megger logo
    Lead Time: 2-3 Weeks
    Free UK Delivery
    Megger CB101 5 kV Calibration Box
    (no reviews)
    £492.00 £410.00
    • Test voltages of up to 5kV
    • Four resistors can be connected
    • Suitable for checking HV insulation testers
    410 Reward Points
    Price Match Guarantee
    MEGITA15
  9. Metrel CS2099 Eurocheck Checkbox
    Metrel logo
    Lead Time: 1-6 Days
    Free UK Delivery
    Metrel CS2099 Eurocheck Checkbox
    (no reviews)
    £511.66 £426.38
    • Test voltage up to 1000 V
    • PE test terminal functional verification
    • Automatic polarity verification
    426 Reward Points
    Price Match Guarantee
    CS2099
  10. Seaward Powercheck 1557 Calibration Checkbox
    Seaward logo
    Free UK Delivery
    Seaward Powercheck 1557 Calibration Checkbox
    (2)
    £630.00 £525.00
    • Compatible with several different tester types
    • Built into its own protective carrying case
    • Doesn't trip RCD
    525 Reward Points
    Price Match Guarantee
    POWERCHECK
  11. Time Electronics 5068 Insulation Tester Calibrator
    Time Electronics logo
    Free UK Delivery
    Time Electronics 5068 Insulation Tester Calibrator
    (no reviews)
    £1,954.80 £1,629.00
    •  Ultra-portable with built-in handle and durable co-polymer plastic case
    • Offers low 1% margin of error on tests
    • Obtain accurate measurements within a range of 100KO to 10GO
    1629 Reward Points
    Price Match Guarantee
    5068
  12. Time Electronics 5080 PAT Tester Calibrator
    Time Electronics logo
    Free UK Delivery
    Time Electronics 5080 PAT Tester Calibrator
    (no reviews)
    £3,598.80 £2,999.00
    • Interlock safety feature
    • Rechargeable battery for convenience and safety
    • Measures earth bond current and load test current
    2999 Reward Points
    Price Match Guarantee
    5080

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About Calibration Checkboxes

What is a calibrator? It checks that a test instrument is calibrated correctly - it's kind of like testing the tester!

For peace of mind, you should check the calibration of your testers between formal calibrations. Independent electrical contractor's voluntary bodies such as NICEIC and NAPIT highly recommend interim calibrations to verify the ongoing accuracy of all test instruments.

A checkbox will allow you to calibrate settings such as:

  • Insulation testing
  • Low resistance and continuity
  • Voltage and frequency
  • Line impedance

All pieces of test equipment, as standard, conform to a set of measurements put down by the manufacturer. The in-built calculation capability of that tester is designed to generate results within the parameters defined, but these results generally become less accurate over time due to the effects of drift. Drift can cause a tester to start generating erroneous readings (extremely dangerous if working with electrical installations), leading to you perhaps being convinced that an installation is safe when it isn't.

Drift can be caused by all kinds of factors. Whether it's a sudden surge in electricity passing through the tester, a bump loosening vital components, or just the effects of age, dirt, and grime, drift can be caused by a wide variety of different things. This is exactly why we carry out calibration, to ensure that test equipment is as accurate as it can be.

Take, for example, a PAT tester. These instruments are generally designed to measure whether an electrical appliance is safe or not. When shipped from a manufacturer, drift should be minimal and the results gained when carrying out testing should be accurate to the standard defined by the manufacturer. If drift is present, the tester may produce incorrect readings, leading to the PAT tester believing that the appliance is safe when it isn't. This can lead to potential electrical accidents and problems arising when the next PAT testing procedure is due.

Regular in-service calibration of test equipment is more likely to keep you within the boundaries of the compliance expected and regulated by the test inspection authorities.

It is also a requirement that test equipment is still calibrated by a qualified calibration lab once a year. The level of accuracy offered by calibration laboratories is generally much higher than using a calibration checkbox, so make sure you remember to carry out this procedure regularly.

It is also worth noting that doing calibration yourself will not generate a fully traceable certificate that may be required by companies wanting a contractor to carry out work. This means that calibration checkboxes are ideal for checking overall accuracy, but the full formal calibration procedure must always be completed regardless.

On Tester.co.uk you'll find calibration checkboxes from many major test equipment manufacturers such as Kewtech, Megger, Metrel, and Seaward. Many of the checkboxes in-store are suitable for use with PAT testers, multifunction testers (MFTs) and other electrical testers as well.

If you have absolutely any questions about our range of calibration checkboxes, please don't hesitate to get in touch. Our expert advisory team is on hand to answer all of your questions.