Bests & Worsts Reviews from Amazon

I bought this item 6 weeks ago and have been using it as a kitchen designer. I have been designing kitchens based off measurements made on this device and have come to discover that the measurements are very inaccurate. They will be between 2" - 6" off from the actual measurements which throws off the whole cabinet design. (And no, its not from the placement of the tracker) I was mortified when my partner went in for a final measure and all my original measurements were completely wrong. The whole cabinet design had to be changed. Unfortunately, I have past the 30 day window of returning the item. After seeing all the rave reviews, I'm wondering if maybe I just have a bad device. But I am in a panic knowing that I measured over 10 kitchens with this device. I tried contacting the seller but there have been "errors" and won't let me talk to them. I'd be willing to give it another device a chance.