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Dual (differential) thermometer with 2-line display for easy temperature comparisons. An optional wireless temperature probe makes remote temperature monitoring easy. Differential temperatures are quickly displayed, while an audible alarm sounds if user-adjustable limit values are exceeded. Current measurements and Max-Min values can be printed on-site with the optional testo printer. Timed interval printing (i.e. once per minute) is possible and controlled from the testo 922.