LEDs have been around for some time, but mostly blinking away as little red indicator lights in electronic equipment.
LEDs问世有一段时间了，但是主要作为电力器件上可以忽略不计小型红色指示灯。
2
This model is designed to meet the basic measuring needs of a wide range of users and applications, while incorporating the advanced technology of the Logic TM electronic digital indicator line.
The problem existing in the original resistance type level indicator is analyzed. The superiority of applying electronic sensor to measure coal level and modification process are narrated in detail.