The Equalizer is a very portable tool. It easily allows any crew member to precisely lay out fence sections equally spaced down to a 1/2 inch tolerance.It eliminates the need for a tape measure or complicated math. The EQUALIZER is simple to use. Just start at the one end post and stretch the cord to the other end post. The tabs on the cord will give you the precise locations for the posts in between. The EQUALIZER is a must have for any fence company that installs wood fence but also works with fence installs of any kind. The cord is engineered not to go over 10 foot centres.