This H-B Instrument DURAC Plus bi-metal dial thermometer has a temperature range of 50 to 550°F. It features stainless steel construction with a polycarbonate lens, and includes a built-in adjustment tool on the beaker clip. For correct temperature reading, the stem must be immersed at least 50mm in liquids and 100mm in gases. An external adjustment nut allows for simple thermometer recalibration. Each thermometer is calibrated in our triple accredited ISO/IEC 17025:2005, A2LA accredited laboratory against equipment whose calibration is traceable to NIST and DKD. Each thermometer is individually packaged in a recyclable box with multi-language (English, French, German, Italian, Portuguese, Spanish) recalibration instructions and a multi-language Statement of Test and Calibration indicating accuracy traceable to NIST and DKD. Range: 50 to 550°F. Divisions: 2°. Probe Stem Length: 200mm (7.9 Inches). Immersion length: 50mm (Liquids) Or 100mm (Gases). Accuracy: 1%. Dial size: 50mm. Case And Probe Material: Stainless Steel. Lens Material: Polycarbonate. 25/Case. H-B Instrument #: 9/4855. Per Each. HB Instrument #: 9/4855.