Hi-Meg ... Ultra-high Impedance Strain Gauge Integrity Tester SOLSTAT's ultra-high impedance, low voltage Strain Gauge Integrity Tester Packaged in an attractive instrumentation case, this unit was custom designed as a dedicated Strain Gauge integrity Tester.  It was portable, battery or wall-wart operated instrument which offered switchable ranges for low voltage testing of Strain Gauge insulation integrity.