Insulation / Continuity Tester Proving Unit



The PU250 allows simple and quick check of insulation resistance and continuity for all makes of I/R testers.

Regular checks outside of the formal calibration process are required for compliance with BS7671 and Part P.

Proving unit to enable compliance to the requirement to maintain records of regular checks on the measurement characteristics and accuracy of test instruments.



Trade Price








Insulation resistance 0.5 – 50 Ω
Continuity 0.5 – 10 Ω
Max input voltage 1000 V DC
Dimensions 115 x 78 x 40 mm
Weight 150 g


Now available is PowerGuard Pro
and PowerGuard Pro Mobile, the
comprehensive software package
for creating a range of test
and inspections certificates.