With all that sophistication, you might expect the Armada Technologies Pro90 to be complicated and full of switches. That's not the case. The Armada Technologies Pro 90 is fully automatic and hassle free. The only button is used to turn the Armada Technologies Pro90 on and hold readings. That's it. Amps, volts, and ohms are all automatically read and the ranges automatically set by the Armada Pro/90. The Armada-Technologies Pro90 is so automatic it even lights up automatically when darkness sets in. Because the Armada-Tech Pro90 is automatically ranged, there are no fuses to blow.