Graduated stem, scaled in Celsius degrees
Calibrated for total immersion
Meet requirements of NIST Monograph 250-23. Thermometers are filled with nitrogen above the mercury column and stems 6 to 7 mm o.d. T1 equals 0.5° to 100° and 1° above 100°. T2 equals 2° to 300° and 4° above 300°.