Spot-weldable strain gauges are used with strain gauge sensors and a vibrating wire indicator or data logger to monitor strain in steel members. The strain gauge, with its tensioned wire inside, is welded to the structural member, so that an increase in tensile strain increases tension in the wire, and a decrease in tensile strain decreases tension in the wire. A strain gauge sensor is mounted on top of the strain gauge. The strain gauge sensor uses an electromagnet to pluck the strain gauge and then returns a frequency signal to the readout or data logger, where it is converted to units of microstrain or period. The VW strain gauge sensor also incorporates a temperature sensor, which supplies data for temperature compensation

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