Today, I took the DMMcheck to the company lab and having prepared a form, I announced that all users of multimeters which are not subject to mandatory calibration are required to show up now in my lab. One by one they showed up with their crutches and cucumbers.
4x Benning MM1 - how can something be SO off and still called a 'meter'? DCV and R ok, AC wayyyy off and µA useless.
An Amprobe 5XP-A which was ok but with the usual deviation of non-RMS meters when measuring that square wave
An Exact (whatever) which was RMS and ok
The Amprobe 37XR-A of my technician, which is in worse shape than mine and did funny things instead of measuring current - but besides that was spot on. I expect him to find a cooked shunt or two.
And a Beha + an Voltcraft which are lab inventory and were passable. And my Amprobe 37XR-A which did not disappoint me - actually I'm thinking that it could be nicely paired with an 38XR-A.
Although one thing is strange about them. The C and L ranges (yes, it does inductance) connect to the µA/mA jack and not the one for U, R and everything else.The SE guy who has one shabby little thing (about your Harbour Fright quality) 'did not find it' and one guy who has at least an Amprobe and a Philips did go AWOL. Verry suspect, that.
Let them know their errors and be disgusted.