81S
Milled working face. Pressure die-cast light metal alloy. Electrostatic powder coating. Measuring face at the ends protected by slightly overlapping body. Highly shock absorbent.

Dimensions: (L)32?? (80cms).
Accuracy: normal position 0.029 = 0.5mm/m, vial-down position 0.043 = 0.75mm/m.