Provide fast, accurate readings where glass thermometers cannot be used. Popular for vats, holding tanks and other equipment. Big, 5" dial swivels for easy reading. Wrap-around plexiglass lens letsin more light for improved visibility. Direct drive gives extremely reliable performance. Accuracy within one scale division; calibration traceable to NBS. 9" stainless steel stem has .625" diameter, with tapered bulb chamber. 1-1/4"-18" swivel nut connection. Fits standard wells. External recalibration. Non-mercury fill solution.