Since 1947 Johnson Level & Tool has been developing solutions to help professional tradesmen improve their work. Our products are trusted by professionals worldwide to work more accurately, more quickly and more reliably. The versatility and durability of Johnson's Johnny Square®" came to us from professional master carpenter Johnny Wong, an accomplished homebuilder with more than twenty-five years experience in the trades. Johnny's crews were never satisfied with their rafter squares' inability to allow for fast and accurate measurements for rip cuts. With more than three years of field testing, the Johnny Square®" helps professionals like Johnny do more work in less time.