Martindale CB12 Calibration Checkbox

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  • Checks ongoing accuracy of insulation and continuity testers.
  • Simply connect test leads and select desired test range.
  • Supplied with Verification Certificate.

rrp £52.00

now £46.00 (Ex. VAT) £55.20 (Inc. VAT)

rrp £52.00


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"Low Cost Calibration of Insulation & Continuity Testers"

  • Description

    Martindale CB12 Calibration Checkbox

    The Martindale CB12 Calibration Checkbox allows electricians to check the calibration of insulation and continuity testers to verify that they are operating within specification.

    The Martindale CB12 CheckBox is an extremely simple to use calibration checker, with connections for your test leads and a dial for quickly selecting the desired range.

    Supplied complete with a Verification Certificate, you can be sure that this calibration box offers a high level of accuracy.

    Please note that the Martindale CB12 Calibration Checkbox is not designed for use with loop testers.

  • Specification

    • Resistance settings: 0.5Ω, 1Ω, 2Ω, 20Ω, 200Ω, 1kΩ, 10kΩ, 20kΩ, 100kΩ, 1MΩ, 2MΩ, 10MΩ
    • Accuracy: 0.5Ω - 2Ω ± 0.025Ω , 20Ω- 10MΩ ± 2%
    • Maximum voltage input: 1000V DC
    • Case: Impact Resistant ABS
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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 2-5 working days*
    • Standard Delivery at £4.95: 2-3 working days
    • Next Working Day Delivery (on select products only) at £8.95
    • Pre 10.30am Next Working Day Delivery (on select products only) at £19.95*
    • Saturday Pre 12pm Delivery (on select products only) at £19.95*
    • Sunday Pre 12pm Delivery (on select products only) at £19.95*

    *UK mainland only

    NOTE! For next working day or Saturday 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.