This invention detects tissue injury by measuring decreased skin conductance as shown by research. Two electrical probes on the device are placed onto a subject's skin. The device sends an electrical microcurrent from one probe, through the subject's skin, to the other probe. A gauge measures the microcurrent in microamps, and a speaker emits a tone with pitch and volume proportional to the percentage of maximum conductance. Per research, the skin conductance will decrease significantly over a site of tissue injury, such as an average of around 70% over a sprained ankle. Also, force gauges measure the force applied to the electrical probes for consistency of measurement. Cotton pads are placed at the tips of the electrical probes for hygiene.