Product Features:

1. The applicable temperature range is -40 ℃~+50 ℃ (the red area in the scale is below zero temperature, and the black area is above zero temperature);

2It can read the current temperature (indicated by the scale on the mercury column) and accurately measure the lowest and highest temperatures of the day (indicated by the small ball below the blue pointer: the left measurement is the lowest temperature, and the right measurement is the highest temperature);

3. Clear display, easy to use, and minimal error.

Usage:
First, press the middle button to make the blue marker slide down and connect to the top of two mercury columns (at this point, the temperature corresponding to the top of the mercury column is the current temperature); After a period of time, when the temperature drops or rises, the left and right blue markers will be pushed upwards by the mercury column (until the maximum or minimum limit of the measured ambient temperature is reached). When the temperature changes again, the mercury column rises or falls back (the blue marker remains in its original position), leaving a distance between the left and right blue markers and the mercury column. At this time, the corresponding scale for the difference between the top of the mercury column and the small ball below the blue marker is the temperature change difference between the current and the previous period. If you hold down the middle button and wait for the left and right markers to fall back and connect to the mercury column, you will start a new period of temperature recording.

Notes:

1Prevent strong impact or vibration;

2If there are bubbles or dispersed fractures in the mercury column, the following methods can be used for repair:
A.Hold the top of the thermometer with your hand and lift it slightly, then gently shake it down, and the mercury column will re aggregate.
B.Place the thermometer in50～60Under hot water at around ℃, after a period of time, bubbles will disappear as they rise due to heating.