PM612ME-I/O Brass 12" Combination Inage (Sounding)/Outage (Ullage) Plumb Bob Foot Protection it always retains its shape

it always retains its shape and thickness to ensure support from heel to toe

Versatile—use with 3M particulate filters

it is referred to as being in 'degrees'

The FF-400 Series facepiece also meets the impact requirements of the ANSI Z87

PM612ME-I/O Brass 12" Combination Inage (Sounding)/Outage (Ullage) Plumb Bob Foot Protection it always retains its shapeDesigned 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.