I was very surprised that it didn't come out of the box. I first drew the flip lines on the board and it looked really good, then I compared it to my woodpecker test square and it turned out to be accurate. I moved the ruler up/down, took it out and turned it over, still dead. The magnets hold very well, no unintentional movements. I bought the 12" and it's a winner, only the next one might get the 6". The company is based outside of Israel, but the device is made in China, no problem as the accuracy is excellent.