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With all that sophistication, you might expect the Pro90 to be complicated and full of switches. That’s not the case. The Pro90 is fully automatic and hassle free. The only button is used to turn the Pro90 on and hold readings. That’s it. Amps, volts, and ohms are all automatically read and the ranges automatically set by the Pro90. The Pro90 is so automatic it even lights up automatically when darkness sets in. And because the Pro90 is automatically ranged, there are no fuses to blow. Truly a novice or professionals dream!