PM706RME Series Plumb Bob, Brass/Stainless Steel Dual English/Metric Scale Oil Gauging Select Material:PM706RME-GTSS - Stainless Steel They have grooves on the

They have grooves on the brass side adjacent to the phenolic scale as recommended by API

Consistent grading and superior workmanship

+ Abrasion resistant

Scales in 8ths

PM706RME Series Plumb Bob, Brass/Stainless Steel Dual English/Metric Scale Oil Gauging Select Material:PM706RME-GTSS - Stainless Steel They have grooves on theDesigned to be used with inage (sounding) measuring tapes to measure the depth of liquid in a tank from the surface of the liquid to the tank bottom. Solid brass 6 3 4" long overall. English side graduated to 16ths, Metric side graduated to centimeters with millimeter subdivisions. Zero calibration point at the bottom of the bob. Weighs 20oz. Select Model PM706RME GT Brass PM706RME GTSS Stainless Steel