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The mechanical and electrical performance of EJA electrical measuring instruments requires stability, simple structure, accurate measurement, and reliable operation. Generally, there are eight technical requirements in this regard: First, sufficient accuracy is necessary; for standard measurements or precise testing, instruments of class 0.1 or 0.2 can be used. Laboratories generally use instruments of class 0.5 or class 1.0. For general engineering surveys, instruments of grade 1.5 or lower can be used. II. Appropriate sensitivity is required: In actual measurements, the appropriate sensitivity should be selected based on the requirements of the quantity being measured. For example, in the case of multimeters, instruments with higher sensitivity should be chosen, whereas for general engineering measurements, instruments with lower sensitivity are preferred in order to reduce costs. III. Good reading device: A good reading device means that the scale markings on the instrument should be as even as possible to facilitate accurate readings. For a scale with uneven markings, the starting point of reading should be indicated using the symbol “”. IV. It should have a good damping mechanism, low power consumption, sufficient insulation strength, adequate overload capacity, and minimal degradation. V. Low power consumption of the instrument itself: If the instrument consumes too much power, it can, in mild cases, alter the original operating condition of the circuit being measured, resulting in significant measurement errors; in severe cases, it may even cause damage to the instrument. VI. Sufficient insulation strength is required: It is strictly prohibited to measure a circuit voltage that exceeds the insulation strength test voltage of the instrument, as this may lead to accidents that pose a risk to human safety and equipment integrity. VII. Sufficient overload capacity is required: In actual use, overloading of the instrument occurs frequently for various reasons; therefore, the instrument needs to have sufficient overload resistance in order to extend its service life. Otherwise, if the instrument is overloaded, in mild cases the pointer will bend, while in severe cases the instrument itself may be damaged.