Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Seems to work pretty good

I bought this for a hydroponics and aeroponics unit I set up to record the air humidity and temperature. It seems to work fine and is in line with my other digital temp/humidity reader. I calibrated it at first by adding 1/4 cup of distilled water and 1/2 cup fo table salt together on a bowl and then putting the hygrometer in with it in a zip lock bag for about 14 hours until it read 75/75 (eHow instructions from Keith Dooley titled, "How to Calibrate a Digital Humidor Meter"). The only complaint is that when it was sitting upside down (the little button at top on the bottom) the reading changed and I had to calibrate it all over again.