This is not a cheap device, so I decided to test it in different ways. First of all I noticed that I had never heard of this brand and did not find any real information in it. In the documentary was another brand name that also didn't have a standout product line. So is this a new startup? Not sure, so does it match other higher level voltmeters? No, it really isn't. I compared it to my 20 year old True RMS meter which has served me well. In a market flooded with inexpensive gauges, prices in the hundreds and up should be a step above the base hobby class. As you can see from the photos, it's a little off here and there, but at the price point where you'd expect pro-level results, it just won't work. Fractions of volts are important. Other measurements I tested resulted in similar inconsistencies. I later compared it to a gauge that sold for less than $50 and the accuracy was about the same. I would return this one.