$34.80The Omni Containment Stainless Steel Grease Depth Gauge Comb is the ideal tool for determining exhaust system grease levels. The Omni Stainless Steel Combs include markings for depths ranging from .002 to .125 inches with notations of Acceptable, Cleaning Required, and Critical Depth as listed in the NFPA 96 2014 edition FIGURE A.11.6.2