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For work between 50 °C and 700 °C, the Model 9173 provides unmatched performance. The 9173 has a display accuracy of ±0.25 °C at 700 °C 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. Of course, there's still a place in the world for dry-wells or "dry block" calibrators. In fact, Hart makes and will continue to make some of the best performing, portable, fast dry-wells in the world. There's still nothing better for a quick test of industrial temperature sensor performance. We just can't resist the urge, though, to keep coming up with breakthrough product designs that can dramatically impact the ways people work and the results they see. For the absolute best performance in a portable temperature source, Metrology Wells raise the standard to an entirely new level.