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Description:The day's maximum and the night's minimum temperature can be determined on these instruments at every time or be read afterwards as conveniently as you read every raise and fall of temperature indicated on it. How they work: First push on the button and replace the blue signals in the tube down to the mercury column in either tube arm. By the original execution of the minimum - maximum thermometer without push-bottom the enclosured magnet reports the signal. When temperature raises of falls, the signals will be pushed upwards and will rest in the capillary in a free position, so that even at some later time you may easily read from the basis of the signals the maximum and minimum temperatures of the last period.