Seaward-17th-Edition-Check-Box-295A914-Seaward-295A914-P-The-Checkbox-16-is-a-convenient-Installation-Instrument-Check-Point-It-is-a-versatile-compact-instrument-which-is-designed-to-provide-a-convenient-check-point-for-installation-test-instruments-including-Earth-Loop-testers-Insulation-Continuity-Testers-&-RCCB-testers-P-P-The-Checkbox-16-provides-a-convenient-&-simple-method-of-confirming-the-functionality-&-accuracy-of-Installation-tester-readings-as-required-for