Our pipe lasers are built tough for long-lasting performance and reliability. They are easy to assemble and use with straightforward, "no instructions-required" controls. The industry's largest display lets you see the percentage grade from outside the manhole. Protective coating prevents damage from stones and debris. Metal housings provide unmatched protection from sewage effluents and clean up like new. Manufacturers include Spectra Precision DG511 and DG711 and other popular brands.