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Gems Warrick general purpose open circuit board control with retrofit standoff. New microprocessor design. Engineered for general purpose single-level or differential applications, these economy priced controls have spade terminals for easy wiring and provide sensitivities up to 1 million ohm/cm. Applications include Single level service, differential service, point level, alarms, valve control, pump control and low water cutoff. Compact size. U.L. "Motor control". Low-Voltage sensor. LED monitoring. AC current minimizes electrolysis. 26K ohms inverse sensitivity, 120 VAC voltage. Measures 2-3/16" width by 2-1/2" height.