此实践练习做为第2章节（指导你使用万用表在电路上测量）。
The practical work supporting Chapter 2 introduces you to using a multimeter to make measurements from circuits.
由于采用了单片机，系统在电路上大大简化，实现了便携的要求。
Because of the use of the single chip machine (SCM), the hardware circuits are greatly simplified, and the demand to be portable is met.
为了能方便地检验和标定温度值，在电路上还设计了温度显示部分，并设计了闭显的功能，以达到省电的目的。
In order to check conveniently the temperature value, we also design temperature display and take the function of lightless display, to save power cost.
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