The Tri-Verifier is a calibration verification unit made by Network Technology in Auckland. It checks the accuracy of three pieces of test equipment in one device: insulation resistance meters, multimeter resistance ranges, and loop impedance testers.

AS/NZS 3000 clause 8.6.3.1 requires you to check that your test equipment is reading correctly on a regular basis. The Tri-Verifier gives you a known reference so you can prove your instruments are accurate, on site, without sending them away to a registered lab.

The standard says “regularly” but doesn’t put a fixed number on it. That means the call sits with you. A sensible rhythm is at the start of a job, after any drop or knock, and any time a reading looks off.

Because the check takes under a minute with the verifier sitting on your workshop bench, there’s no reason not to do it often. If something goes wrong on a site and you end up in court, a documented on-site check is the answer to “how do you know your reading was right?”

No. The verifier provides a set of known reference values for your meter to read against. Your instrument does what it normally does in service — the verifier doesn’t push any load or voltage into it that it wouldn’t see on a normal job.

If anything ever looks wrong during a check, stop and ring us. We’re an Auckland workshop, not a help desk on the other side of the world.

The Tri-Verifier ($250 + GST) is the full workshop unit. It checks all three things: insulation resistance meters, multimeter resistance ranges, and loop impedance testers. It lives on the bench.

The Quick Check ($105 + GST) is the smaller, lower-cost unit. It does the resistance check only — four ranges, same accuracy as the Tri-Verifier on the resistance side. It’s the one you throw in the van or your toolbox.

Most electricians end up with both: the Tri-Verifier on the workshop bench, and a Quick Check in the kit for spot checks on the job.