The thermometer is how points?

Now on the market commonly used thermometer can be divided into: glass rod thermometer, bimetallic thermometer, pressure type thermometer, solar thermometer, temperature and pressure of a surface, surface thermometer, etc. Glass thermometer, it is a kind of artificial fire, priming and other process, low cost, measurement accurate, easy to use, without the power of the traditional temperature measurement products, defect is broken after mercury is not easy to handle, widely used in the production and living, with round or triangular rods glass as raw materials, can be divided into full immersion type thermometer draw immersion type two kinds of thermometer. Bimetallic thermometer is a round shape into threaded heat bimetallic strip as thermal devices, and put it in a protective sleeve tube, one end is fixed, known as the fixed end, the other end of the connection on a thin shaft, called the free end. Spool at the free end is equipped with a pointer. When the temperature changes, the resulting thermal devices the free end of the rotation, drive the thin axis from the Angle of the pointer changes, corresponding temperature indicator on the dial. Solar electronic thermometer is the use of day Yang can provide accurate temperature indicating and wired sensors. It is the light level is higher than 100 lux show, when the light levels drop, using the backup battery to provide power to continue to display circuit. It has a bright, easy to read LCD display. Pressure type thermometer, is based on the sealing temperature measuring system of liquid evaporation changes in the relationship between saturated vapor pressure and temperature, the thermometer for temperature measurement. A surface can be simultaneously measure the pressure, temperature and pressure and water temperature degrees Celsius and Fahrenheit. Surface thermometer is to rely on the principle of the double metal heat bilges cold shrink principle of sensors to work, by contact spring or magnet at the bottom of the thermometer to measure the metal surface and reading. This type of double metal surface thermometer can range from - 40 c to 500 c, the precision can be in for some using occasions for accuracy is not high, can yet be regarded as a money and cheap thermometer of beauty