The Polanik Hammer Measuring Device is a great tool that is accurate and easy to use. The device itself is worthy of a 5 star review but I gave it 4 stars due to the manner in which it was packaged during shipment. There was no packing inside the cardboard box to protect the device. As a result, two of the three leveling feet were broken during shipping. I managed to find acceptable replacements at a cost of about $25.