It worked well for the first few months and still semi-works occasionally. The issue is that it needs to emit a long beep to indicate it's analyzing, but most of the time it just gives a single beep, you blow, and then it beeps again and shows 0. However, if you try it multiple times and finally get a long, continuous beep, it will take a reading.
Basically, I have to try 4鈥5 times before it works. I鈥檝e tried blowing hard, soft, and medium鈥攏othing makes a difference. I thought the issue might be me, but I鈥檝e changed the batteries, and now, after 8 months, it doesn鈥檛 work at all.
When it worked, it was great, but if anyone knows what the problem might be, please let me know鈥攐therwise, I鈥檓 ready to toss it in the garbage.