1. Instruments are divided into single-function, multi-function and special-purpose instruments. According to the characteristics of sensor output signals, sensors with analog output signals and sensors with digital output signals can be equipped. In addition, it also has the function of pricing, which is more than one meter. The single-function instruments in its series include A 1-measuring type and A2-counting type. 2. Advantages and disadvantages of multi-function instruments and single-function instruments: Multi-function instruments have strong adaptability and can be widely used in various non-automatic electronic weighing instruments and automatic electronic weighing instruments. However, the software development cycle is long and the hardware support cost is high, so its manufacturing cost is high. Single function instrument: the software development cycle is short and the hardware is few, so its manufacturing cost is low. Special instruments; The manufacturing cost is between single function and multi-function. In terms of failure rate, multi-function is higher. 3. Problems to be considered when choosing an instrument A. What type of instrument to choose should be based on actual needs, rather than selecting more functions; B, choose the products that have obtained the production license of measuring instruments; C. All technical indexes of the weighing display controller meet the national standards; D, the key is to check whether it meets the safety protection requirements; 4. Dynamics of weighing display controllers at home and abroad. Generally, the instruments developed and produced in China are only equipped with one scale, while the instruments produced abroad can be equipped with multiple scales at the same time. You can enjoy its software function and hardware support, which relatively reduces the manufacturing cost and management cost in use. 5. Precautions When developing new instruments, attention should be paid to the reliability of safety performance, and its technical requirements and measurement should meet the requirements of the main clauses in OIML76, especially in anti-interference. This is a general optional inspection, but it can reflect the technical performance of the display and the standardization of various functional requirements. 6. Maintenance and timely maintenance is the key to prolong the service life of equipment. It is necessary to use measuring instruments in the designated environment. In order to avoid unintentional damage to the equipment, you must read the operating instructions and technical specifications carefully before operation, and then use them after confirmation.