This Enviro-Safe® aluminum duplex case pocket thermometer is for use with ffieldstudies, waste water treatment and any “on-the-go” applications. Thermometer is 160mm (6.3in) in length and is a total immersion thermometer. This accurate and safe thermometer features environmentally safe non-toxic, non-hazardous, biodegradable Enviro-Safe® liquid EnviroKleen™ certified by ChemTel, an independent laboratory. Has the same accuracy as similar mercury-filled thermometers, but unlike mercury-filled thermometers it is 100% environmentally safe. Includes a multi-language (English, French, German, Italian, Portuguese and Spanish) Statement of Accuracy indicating accuracy traceable to NIST and DKD/PTB. Tested and calibrated in H-B Instrument's exclusive triple accredited/registered ISO/IEC 17025:2005, A2LA accredited laboratory against equipment whose calibration is traceable to NIST. Made in the USA. Thermometer Fill Type: Enviro-Safe®. Back Glass: White. Range: -5 To 50°C. Divisions: 0.5. Accuracy: 0.5°C.