The difference in temperature between an electronic thermometer and a mercury thermometer is about 0.5 degrees. Electronic thermometer normal test value should be in 36.5-37.5 or so, may be different and your measurement method is different, but under normal circumstances will not deviate too much, low belongs to the phenomenon of relatively normal, it is recommended that the first time to use or purchase the mercury thermometer to do the following comparison.
The accuracy of the mercury thermometer depends on the scale value, the current scale can only reach 0.1 degrees, and then can only estimate the reading. Electronic thermometers are also accurate to 0.1 degrees, about the same as mercury.
One of the advantages of mercury thermometers is that they are very stable in terms of accuracy, but in general, electronic thermometers are the most accurate in the 37-39 range, and higher or lower will be worse.
Expanded information:
Considering the mercury hazards of mercury thermometers, many countries have taken measures to ban them. As early as 1992, Sweden banned the sale of all medical devices containing mercury. Britain, France, Denmark and the Netherlands? have also banned their use and sale. In the United States, 13 states and cities, including San Francisco, Boston and Michigan, have banned the sale of mercury thermometers since 2000.
The European Commission has also banned the sale of mercury thermometers since 2005 and their export since 2011, and in December 2008, the Argentine government announced that it would ban the production and import of mercury thermometers. The World Health Organization has also established a Global Mercury Elimination Program, with the goal of reducing demand for mercury-containing thermometers and sphygmomanometers by 70 percent globally by 2017.
But mercury thermometers have not been banned in China. Mercury thermometers are widely used in the medical field and in ordinary households, and are available in some pharmacies. Data from the China Medical Devices Industry Association (CMDIA) show that in 2008, the national production of mercury thermometers consumed 109.25 tons of mercury, equivalent to the amount of mercury used in 21.85 billion standard mercury-containing energy-saving lamps.
According to statistics, the country produces about 120 million mercury-containing thermometers each year, and China disposes of more than 10 tons of mercury as waste each year due to the breakage of mercury thermometers.
Electronic thermometer Note:
1, when the back of the electronic thermometer position shows "□" indicates that the need to replace the battery, the battery using AG3 button battery or SR41 silver oxide battery. When replacing the battery, first open the upper battery cover. Tightly press down the switch guide skin and then dial out the movement about 2.5MM (dial out the movement can not exceed 3.5mm), with a small bottle screwdriver to remove the battery. Insert a new battery with the positive terminal facing up, insert it into the movement, and carefully close the battery cover.
2, electronic thermometer can be cleaned by wiping with a damp cloth, such as waterproof type can be put directly into the water to clean. Can not be placed in high-pressure gas, high temperature environment, not in contact with corrosive substances. The damage caused by this is not responsible for quality assurance:
3, working temperature: 10 ° C - 40 ° C working humidity: 30% - 80% RH
4, preservation of temperature: -1 ° C - 60 ° C preservation of humidity: 10% - 80% RH
5, the service life: AG3 or SR41 button battery for about 200 hours
6, display accuracy: ± 0.1 ° C (32 ° C to 43 ° C) or ± 0. 2 ° F
Baidu encyclopedia - mercury thermometer
Baidu encyclopedia - electronic thermometer