A checkbox test is required by many schemes to ensure that equipment is still giving correct results between yearly calibrations. PAT-Services’ very own Calibration Checkbox (also known as a calibration checker) is one of the cheapest checkboxes available. Although this is a fantastic little calibration checker, we also provide models from Seaward, Megger and Kewtech.
Similar to a checkbox test, a voltage proving unit test is highly recommended by NICEIC and NAPIT for compliance reasons. A proving unit is used alongside a voltage tester to make sure circuits are correctly shown as not live. We supply only the best proving units from Metrel, Martindale and, Socket and See.
See below for our full range of tester checkbox and proving units. Or call us on 0800 101 8181 if you have any questions.

- Calibration Checkbox
- Cheapest checkbox on the market reqd by NICEIC & NAPIT.
- £39.00

- Martindale PD240 Pocket Sized Proving Unit
- For voltage testers and multimeters
- £44.95

- Kewtech Kewprove 3 Proving Unit
- Required by the NICEIC and NAPIT
- £57.95

- Metrel Europrove CS 2090 PU5 Proving Unit
- Suitable for NICEIC and NAPIT Compliance
- £59.00

- Martindale PD690 Proving Unit
- Produces 690V AC/DC for voltage tester checking
- £67.95

- Megger MPU690 Proving Unit
- Generates voltages from 50 to 690v in five steps
- £74.90

- Socket and See SP 200 Professional Proving Unit
- Professional proving unit able to generate AC waveform
- £75.00

- Martindale VIPD Voltage Tester & Proving Unit
- Proving unit and voltage tester in a case
- £97.95

- Electricians Accessory Bundle 1
- Electricians Accessory Starter Bundle
- £99.00

- Seaward Pat Tester Checkbox
- Pat Tester calibration Checkbox from Seaward.
- £169.00

- Transmille 2080 17th Edition Calibrator
- 17th Edition Checkbox
- £225.00

- Megger MTB7671 Meter Test Box - Calibration Checkbox
- Works with all testers for Part P Certification
- £249.00









