I have had this AM-220 for a year and a half now and when compared to my other 2 multimeters it seems to be out of spec. I am measuring a -0.6% error (with 2 counts added just in case, could be worse) on the lowest DC volt range. The accuracy is reported to be 0.5%. This worsens on higher ranges, up to 0.8% on the 4V range!. The other 2 multimeters measure exactly the same voltage on most conditions. These are an Extech EX330 (0.5% accuraty ±2 counts) and a Keithley 191 (0.007% ±3 counts 1 year accuracy). As you can see, the odds are against the Amprobe being in-spec.
I am starting to dislike Amprobe for this. They are supposed to be more reputable, but this meter drifted out of spec very quickly. It also has some issues with the range switch, which has become a bit erratic. I suspect it has to do with the contacts having some issues. This multimeter hasn't been dropped. It hasn't even been out of the lab (the Extech one has). I am looking to adjust it back to spec, but I want to hear your opinion on this.
Ivan.