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Caldwell Instruments manufactures a containment sump and dispenser pan mechanical tester for the underground fuel tank market, Click on products above to see details on this low cost, accurate device.

Caldwell Instruments Also manufactures precision tank gauges for the Marine and Recreational vehicle industries. Gauges are based on ultrasonic principles and the accuracy is not exceeded by others. These gauges are for fuel, fresh water, gray water, black water and other liquids.

Click here to see the marine & RV tank gauge site