This instrument is very precise. But as someone below said, dot movement is too extreme. And the magnet on the side is very weak. This side magnet is almost useless. And I asked the seller a few questions about this device, but the reply was too slow and they didn't give me the proper information.
Very precise unit but I wish to be able to get the dot center with wider range. Always left or right even at 0,001 close. Magnet on the back great but on the side, not really strong. So sad the charging light does not come off when fully charge. Sight lcd is tiny plastic, not strong. For the price, I wish to get better quality.