I've got the same model, had it for about a year, forget which box store it came from, but price was in that $20-30 range. I'd not heard of the palm test before tonight - someone want to expand on that for me? It seems close enough for what I use it for, which is checking up on the wood in my stacks, and verifying that some of the standing dead I cut is ready for the "straight to the stove" shortcut that saves me from stacking, hauling, and restacking if it's not needed. It'll go straight to 50% in green oak, down to too low to measure in some 1x pallet wood that's been indoors for a while.
My one complaint is that the probes (which are replaceable but I haven't looked at where to get em or cost) are pretty wimpy and bend easily if trying to check harder woods. I've bent them back every time so far, but I'm waiting for the day one snaps off when I try to straighten it out.