Product review (5 stars): it works like it's supposed to. and then some
I didn't give it five stars simply because it takes forever to calibrate (updated to five later), you either hold the button down and let it add value slowly, or you press it as fast as you can. (because values only adjust up- then starts over) also it has no option to turn off the beeping when you press buttons. it works really well. had to go through a learning curve to figure it out due to my error in understanding some value fundamentals about barometric pressure.
update, six months or so later: also this thing is made is Asia somewhere, most likely china. so the instructions are hodge-podge just an FYI. I use this for extreme range shooting since I am too cheap for a kestrel. that means I beat this thing up. It gets tossed around, dropped, thrown, and it has yet to fail me. I am still on the same battery it came with, and it still procures very accurate readings as far as I am concerned. if you are looking for something that reads absolute pressure and ambient temperature accurately and dynamically for shooting purposes- this thing is a fantastic option. updated to five stars for its value and durability.