Check the listing for details. Dwyer Instruments 45 IN. W.C. 10PSI Pressure Switch 1910-0. Condition: New, Made in United States. Listed at 39.00 USD. The Dwyer Instruments 45 IN. W.C. 10PSI Pressure Switch 1910-0 is a pressure switch designed for use with instruments. Manufactured by MERCOID, this switch is specifically designed to measure pressure in inches of water column (IN. W.C.) up to 10 pounds per square inch (PSI). Ideal for industrial and electrical applications where precise pressure control is essential, this pressure switch offers reliable and efficient operation for a variety of instruments.