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305.020 Max-Min Thermometer ℃+℉

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 minima-maxima-thermometer without pushbutton the enclosed magnet reports the signal. When temperature raises of falls, the signals will be push 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.

230mm(L) x 57mm(W) x 20mm(H)

In case of air-bubbles in the tube connect first of all the marks with the mercury column, which can be achieved by shaking the thermometer, so that the air-bubbles can pass the marks. 
Then put the thermometer on the radiator (not on a stove!). Due to the heat the air-bubbles are then pressed upwards and can escape. Should the mercury column have separated possibly in transport, do some shaking in a similar and vigourous manner as you do with clinical thermometers and mercury will join again.
If one or both marks are not visible handle the instrument in the same way by shaking while pushing the button.