Reotemp’s Series PM40 features a stainless steel case, tube and socket, making the gauges resistant to corrosion from both environment and media. Liquid filling is recommended for severe service. The economical and attractive crimp ring design, along with a variety of convenient panel mounting adapters, make this popular gauge the right choice for many applications. Economical Gauge with Stainless Steel Case and Internals Case is Easy to Fill in the Field Ideal for Both Indoor and Outdoor Applications ASME B40.100 Design