Title: JUNK
Review: I bought two of these on the strength of good reviews. But when I tried to calibrate them I found that both were off by several percentage points - and they disagreed with each other! So much for factory settings! Also, the calibrating wheels on both didn't work - turning them did nothing. These are cheap pieces of plastic and certainly not worth the nearly $20 each I paid for them. I'm returning both.
Is this product review negative?