Mid-West Instrument offers differential pressure gauges, switches and transmitters. Over 30 Years of proven design in the field for use in Hazardous locations CSA, UL, KOSHA, IECEx Certifications LVD RoHS Compliant Certifications apply to the entire assy. as mandated by Hazardous Location Stds. 3-4 Unannounced inspections by CSA and UL per year. Yearly ATEX and KOSHA audits.