Pressure Gauges are used to monitor the injection pressure of the grout being delivered to the grout hole. It helps to insure that the maximum allowable pressure is being applied to achieve the desired results of the grout program design. It also helps to prevent the application of an injection pressure that is too high and could overstress the foundation materials and the structures being grouted.
Pressure Indicators measure the factors that cause changes in the ecosystem. Pressure indicators are contaminants or invasive species that degrade the native ecosystem.