Featuring a case to protect from breakage, these total immersion thermometers are a compact 160mm 6.3in, making them ideal for field studies, waste water treatment and any inon-the-goin applications. mercury free; contain blue organic liquid against lead-free, white back glass tested and inspected by our usa quality team traceable to nist include multi-language english, french, german, italian, portuguese, and spanish statement of accuracy and traceabilitycase options include: plastic window – encased in plastic with an open window closed plastic – housed in removable plastic case closed metal – housed in a removable metal caseshould you require an individual thermometer calibration report, factory calibrated thermometers or custom calibration services are available.