Gadgets: screwdriver, diagonal pliers, needle-nosed pliers.
Circuit board maintenance tools, instruments and meters-pointer multimeter and digital multimeter pointer multimeter are general instruments. The process of pointer swing is intuitive, and its swing speed can sometimes objectively reflect the measured size, so the reading is intuitive and vivid. Digital multimeter is an instantaneous sampling instrument. Generally, the measurement results are displayed once every 0.3 seconds, and sometimes the sampling results are just very similar, which is not as convenient as the pointer reading results. Generally, the internal resistance of pointer multimeter is small, and the internal resistance of digital multimeter is often above1mΩ, which can have less influence on the tested circuit and get higher sensitivity and measurement accuracy.