Welcome to the only Calibration checkbox that fits in your instrument case where you need it.
Calcard is the smallest, most useable and cost effective Calibration checkbox on the market,
the credit card sized: -


The Calibration Checkbox CalCard EXT1 works similar to the more commonly termed "Calibration Checkbox". It provides a range of fixed calibration resistance's for confirming the operation of electricians insulation and continuity instruments as per NICEIC resistance checkbox.. This is a fundamental requirement of "Part P" for domestic installers.
The difference and the best advantage is this Checkbox fits in your instrument case where you need it, not as a box lost in in the van or toolbox.
The CalCard EXT 1 calibration checkbox is currently been used by hundreds of Part P registered tradesmen who have been certified and their records checked by inspectors against measurements using the Calibration Checkbox CalCard Ext 1
These professionals are members of various institutes and recognised bodies. To date the Calibration Checkbox CalCard Ext1 has been viewed and accepted by IEE, NICEIC, NAPIT, ECA, IET and ELECSA
to name but a few.
My name is Steve Brown. If you have any questions about the Calibration Checkbox CalCard Ext1, simply call me or send an email via Your email Program.
Copyright © 2008 Calltronics Limited | All Rights Reserved | CalCard EXt1 is Patient Pending
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