Mid-West Instrument

Mid-West Instrument

Mid-West Instrument is a U.S.-based manufacturer of differential pressure measurement instruments and backflow prevention testing equipment. The company produces gauges, test kits, and accessories engineered for accurate pressure measurement in fluid handling systems across industrial, HVAC, and plumbing applications.

Their backflow test kits, including the 845 series, are widely used by certified backflow prevention testers for verifying and certifying reduced pressure zone (RPZ) assemblies, double check valve assemblies (DCVA), and pressure vacuum breakers (PVB) in compliance with local plumbing codes and water utility requirements.

Key Product Lines

• Differential Pressure Gauges: Instruments for measuring pressure differences across filters, heat exchangers, flow elements, and control valves
• Backflow Prevention Test Kits: Portable field kits for testing and certifying backflow prevention assemblies per AWWA and local standards
• Pressure Transmitters and Switches: Electronic instruments for process monitoring and automated control applications

Industries Served

Mid-West Instrument products are used in water utilities and municipal water systems, HVAC system commissioning, fire protection and sprinkler system maintenance, industrial process control, and building plumbing inspection. Their test kits are standard tools for licensed backflow prevention testers required to certify assemblies protecting potable water supplies from contamination.