The proper terminal must be used for the corresponding dial setting. Please note the Amp designated by A. The milli and microAmp function is noted with the µmA abbreviation. The larger Amp setting should be used to start testing Amps. If it is less than 500 milliAmps, the test lead can be moved to the next terminal position for more accurate low Amps testing. Starting in the low Amps position can lead to blown fuses. Fuses are activated only in the Amps and micro/milliAmp settings. The fuses are designed to protect the user from current draw and also protect the meter from over-ranging current. Replace the fuses only with the same style and ratings.