Tensometer is a useful device that helps to provide a long service life of a band saw blade. It is also useful in providing rectilinearity of cutting, as it helps to determine the correct tension of the blade. Using the tensometer limits the possibility of a band saw blade to break, because it enables to control the blade tension during the instalation on the machine. Tensometer is made of light aluminium cast and bright colors of the scale are very helpful during the usage. The device is distributed in a handy metal case and a user manual is provided.