- Socket & See CB400 Non-Trip Installation Testing Calibration Checkbox
- Megger MTB7671 17th Edition Calibration Checkbox
- Seaward PAT Checkbox (227A910)
- Provide a safe, simple and quick means of checking the calibration of Seaward PAT's.
- Used to check all portable appliance testers in the Seaward range, as well as those from other manufacturers.
- Lightweight and portable and easy to operate.
- Provides an immediate indication of the accuracy of the instrument.
- Martindale CB12 Calibration Checkbox