Thermometers feature a 1/2" NPT threaded connection and polycarbonate lens (Cat.Nos. 8-B61310-9400 and 8-B61310-9500 feature a glass lens). External adjustment allows for simple field calibration. For correct temperature reading, stem must be immersed at least 50mm (2") in liquids and 100mm in gases (4"). Each thermometer features 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.