Detailed Product Description Pressure Gauge:Safety valve: viton Working temperature: -40 to + 80 degrees Celsius Case and ring: chrome-plated steel case, 304 or 316 stainless steel case Window: acrylic, tempered glass, safety glass Customized specifications are welcome Case & ring: chrome-plated steel case, 304 or 316 stainless steel case Window: Acrylic, tempered glass, safety glass