Product review (1 stars): WILL NOT CALIBRATE!
I purchased this product after looking at several of the top brands and reading multiple reviews.  I must say it's worthless.  Device did not come pre-calibrated.  The device will not calibrate I have tried 100 times 700 different ways.  I even had my wife try.  Ive used all of the calibration packets.  When I say it won't calibrate I don't mean it is .1 or .2 off.  It's not even close!  Half the time it locks up @ 0000 or 7.00 during the calibration process and I have to remove the battery.  I have yet to reach out to the company to see about their return policy so I can't speak about customer service.  It's possible that I could have just gotten a bad egg.  The product does seem well made but I really wish it would have worked.