CAL BOX Calibration Checkbox

  • Prove the accuracy of continuity and insulation resistance readings.
  • Check RCD and loop test accuracy at a dedicated labelled socket.
  • Supplied with Certificate of Conformity.

rrp £59.95

now £39.95 (Ex. VAT) £47.94 (Inc. VAT)

rrp £59.95

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"The UK's number 1 Calibration Checkbox suitable for ALL Multifunction Testers"

  • Description


    The CalBox Calibration Checker is a simple way to ensure the on-going accuracy of electrical test equipment between dates of calibration. This means that you can produce a record of instrument accuracy to your regulatory assessor (NICEIC, NAPIT, ELECSA, ECA) in order to comply with the assessment procedures that they have in place. It also gives you, the user, peace of mind that your test instrument is giving you accurate readings between its annual calibration.

    The unit is easy to use – simply plug your tester (analogue or digital) into the CalBox to prove accuracy of both continuity (0.5, 1 & 2 Ohms) and insulation resistance (0.5, 2 & 200M Ω. Checking RCD and loop test accuracy of your instrument can be conducted at a dedicated labelled socket at your premises (bench mark circuit), making the CalBox a valuable accessory to carry within your toolbox.

    The CalBox calibration checker is built with high quality resistors which can be tested at 1000V DC and are manufactured to produce an accuracy within 2%. The Cal Box also utilises universal 4mm socket connectors, enabling use with any brand of test equipment that you own.

    Calibration Verification record Sheet Metrel Accessories

    THE CALBOX Key Features

    • Simple to use
    • Verifies Continuity readings
    • Verifies Insulation readings
    • Unlimited Verification record sheets
    • Supplied with Certificate of Conformity
    • Rugged Construction
    • Trendy design
    • Small, light & portable
  • Specification

    The CALBOX Calibration Checkbox Specifications

    Function Check Check Values Accuracy Rating
      200MΩ 2% Up to 1000V
    Insulation 2MΩ 1% Up to 1000V
      0.5MΩ 1% Up to 1000V
      1% +/- 20mΩ Current rating 1A
    Continuity 1% +/- 20mΩ Current rating 1A
      0.5Ω 1% +/- 20mΩ Current rating 1A
  • Supplied Accessories

    • 1 x CALBOX Calibration Checker
    • Certificate of Conformity
    • 24 Months Warranty
  • Product Questions

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  • Reviews

    Review by Sid (Posted on 26/09/2013)
    Hi, I bought one of your Cal Box calibration checkers a few weeks ago prior to an external audit and its been worth every penny. We have six insulation testers in the company, three of them were 2nd hand bought cheap of an auction site and the others range in age from 6 years to about 2 years. Guess what? Two of the 3 cheap ones from the auction site were well out of specification so we hid them! If the inspector had checked them we might have failed but luckily we passed :) Not sure whether to bin them or put them back on eBay!! Considering the Cal Box cost ,its really well built, light and compact and arrived next day.
    Review by Steve Tyson (Posted on 27/11/2012)
    Thanks for my freebe! Always love getting free stuff with my tester, cheers

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  • Delivery Information

    At we understand the importance of a reliable delivery service when shopping online. Especially when the goods are often essential to your working day. If your goods are required by a certain date please feel free to contact us for an honest and realistic indication whether this can be met.

    We use DPD/Interlink for all larger items and Royal Mail for smaller items and accessories. With DPD/Interlink you will receive a 1 hour delivery window on the day of delivery via e-mail/text so you will not have to wait around all day. We also offer delivery options for goods required urgently on certain products, all which are sent by DPD/Interlink on a fully traceable and manageable service.

    Our charges for UK deliveries:

    • FREE Delivery (on select products only): typically 3-5 working days*
    • Standard Delivery at £4.95: 2-3 working days
    • Next Working Day Delivery (on select products only) at £7.50
    • Pre-Noon Next Working Day Delivery (on select products only) at £9.50*
    • Pre-10.30am Next Working Day Delivery (on select products only) at £18.50*
    • Saturday Pre-Noon Delivery (on select products only) at £14.50*
    • Sunday Pre-Noon Delivery (on select products only) at £14.50*

    *UK mainland only

    NOTE! For next working day or Saturday/Sunday delivery options the order MUST be placed no later than 3pm on the working day before delivery is required. After 3pm, please arrange with our staff before selecting a priority delivery service. Priority services are available to UK mainland residents only.

    Customers outside the UK: exports to many countries all over the world. Prices for shipping vary on location and weight/dimensions. Costs are calculated for certain countries at the checkout. If your country is not included in this list please e-mail with your name, address and the items you would like to order for an accurate shipping quote.