The gauge consists of a metal plate with accurately positioned markings. The metal plates are heavy 18 gage (0.048in or 1.2mm) enameled iron or steel, which is completely covered with a baked-on porcelain enamel finish to resist rust or discoloration. Different colors of enamel are used to provide the markings; typically black numbers on a white background.
Style”M” Metric gauge, 65 mm wide. Divided into centimeters with each decimeter numbered. Gauges for any elevation may be assembled by using separate number plates (sold separately).
39742 1 Meter Section