Thermometers feature a 1/2" NPT threaded connection and polycarbonate (or glass) lens. External adjustment allows for simple field calibration. For correct temperature reading, stem must be immersed at least 50mm in liquids and 100mm in gases. Each thermometer features a stainless steel case and stem and is individually packaged with a multi-language (English, French, German, Italian, Portuguese and Spanish) Statement of Test and Calibration. Ordering information: The 0a€“200F model features a glass lens.