The BDI strain transducer from Bridge Diagnostics Inc.
, Boulder, CO, is designed to measure strain on bridges, buildings, cranes, and other civil structures and can be installed within minutes on steel, concrete, timber, and FRP members. The full Wheatstone bridge sensor has 2% accuracy and provides more than 3 times the output of a standard quarter-arm foil strain gauge installation. You can instrument a structure at 50–60 locations in <1 day. Transducers are reusable with periodic NIST-traceable recalibrations.