I have one. Not sure how helpful it is. If I take a cigar out of an acrylic jar regulated to 69RH - and insert the prongs 3-4 places in the foot, I get 3-4 readings. The initial stick reads initially reads higher, then after it sits there for 2-3 seconds, drops, sometimes substantially. I don't think the device is inaccurate, it is ALWAYS at 70RH when I test it against the calibration sensor. So if there are 4 "accurate" readings, with differences of 7-12RH, does that mean that the cigar sitting in a 69RH acrylic jar for 2-3 weeks is still not balanced? If not after 3 weeks, will it ever be balanced? Do you average the readings to decide if you want more or less humidity before smoking? There is very little explanation on how to use the device. There is a marketing blub - this RH is perfect, this RH is too moist attributing to these symptoms, this RH is to dry attributing to this symptom.
I'm trying to make sense of how to use it to decide which cigars perform best at different RH levels. The inconsistencies of 3-4 reading in the same cigar make this extremely different. For now, it's another toy to have fun with at parties.