ok, call me a fool but i found 1°F stability to be doable. i use a BBQ thermometer as a "fair witness" for the temp readout, measuring the hottest part of the heater. the middle of the bud vial hits this temperature in the first 5 seconds of the draw.
the mighty has +/- 5°F temperature swing. they should try harder.
But remember, the PLUS/MINUS accuracy is often a factor of the price of the measuring devices.
+5 to -5 degrees F accuracy, is common for most temperature probes. One must also factor how accurate the meter itself is. If you want to really trust a digital multimeter, you would need 3, assuming you get two different readings, the 3rd meters reading might suggest which one is accurate. There are also devices available that send an accurate voltage to the meter, these are a bit obscure, but I bought one, so I could test the accuracy of my various DMM’s. Fluke meters while expensive, are very accurate.
Once you are confident your meter is “accurate”, then the plus/minus factor of the probe is in play. I also have all in one probes, no DMM involved, but can do rough confirmation tests using the boiling water and ice tests!
Thankfully, I’ve been down this rabbit hole, and have moved on a bit, more towards what results I’m getting at selected vape device temp settings, and enjoying.
Experimentation is fun, though many don’t take the amount of time to learn all the pitfalls, or want to spend enough for accurate measuring equipment.
Expecting 1-2 degrees of real world accuracy, in the vape device market , is ………