METROLOGY WELL: For work between 50 degrees Celsius and 700 degrees Celsius, the Model 9173 provides unmatched performance. The 9173 has a display accuracy of plus or minus0.25 degrees Celsius at 700 degrees Celsius and an immersion depth of 203 mm (8 in). Stability and uniformity performance of this unit are enough to dramatically reduce uncertainty budgets for calibrations of thermometers at high temperatures. Insert A, Al-Brnz, Misc Holes, 50 DEG C to 700 DEG C. Includes INSZ and built-in Reference.