PM612ME-I/O Brass 12" Combination Inage (Sounding)/Outage (Ullage) Plumb Bob Foot Protection 3M Respirator Selection Guide

3M Respirator  Selection Guide

Versatile—use with 3M particulate filters

it is referred to as being in 'degrees'

Minimize expenses and maximize productivity with the MicroDock II

PM612ME-I/O Brass 12" Combination Inage (Sounding)/Outage (Ullage) Plumb Bob Foot Protection 3M Respirator Selection GuideDesigned to accurately measure the distance from a fixed reference point on top of a tank to the surface of the liquid inside the tank. The zero calibration point is at the inside top of the bob hole. They have grooves on the brass side adjacent to the PHENOLIC scale as recommended by API. Solid brass 12" long inage outage bob used with inage, sounding tapes. Bob has a 0 to 6" outage scale with the zero calibration at the bottom on the English side.