Strain gauge coding system                          Color code of gauge base for different test specimen   TML strain gauges are almost self-temperature compensated. Series F, UF and WF are self-temperature compensated for the most commonly found material mild steel, stainless steel/copper alloy and aluminium, and are identified with gauge base colors of red, brown and green respectively.   Specimen material Ther?mal expansion Color of backing Example of type name  Mild steel 11×10-6/°C Red FLA-3-11 Stainless steelCopper alloy 17×10-6/°C Brown FLA-3-17 Aluminum 23×10-6/°C Green FLA-3-23   Name of each part           Dimensions are indicated in the specification of each gauge. Each gauge pattern indicated in respective column is not in an actual size.