Yes, you are right! You simply touch the test leads to the exposed metal on top of the fuse and the Amp Hound tells you how much Current is in the circuit. And yes, you can read the Voltage drop with a DMM. Now, let's look at the difference:
If I'm looking for a parasitic drain with a DMM I need to look at the meter every time I contact a fuse with the test leads. The Amp Hound will tell you with a Steady Beep if no Current is present and 3 Beeps if SOME Current is there. I can literally blaze through a fuse panel and instantly identify all circuits that are "ON" without ever stopping to look at the tool. This is especially helpful with fuse panels that are located under the dash!
Now, when I have found SOME Current in a circuit, all I have to do is tell the Amp Hound the type and size of the fuse and it will tell me how much Current is flowing in the circuit without having to reference a chart somewhere.
Since the Amp Hound will measure Currents up to 50Amp I no longer need two different tools to find parasitic drains and working drains. This is the first tool on the market that will permit instant Fused Circuit Current measurements without removing the Fuse!!
The Amp Hound can measure the Current in several types of fuses going from 5mA to 30Amp. So, not only is this tool a wonderful parasitic drain finding tool, it is also a wonderful Current measuring tool that can measure Current faster than any other tool on the market because you don't have to pull the fuse or reference a chart!!
Can you tell me where to find the charts that show all of these Voltage drops for all of these types of fuses at all of these different Amp readings? (As the Current gets closer to the fuse rating the Voltage drop becomes more non-linear, so a simple chart calculated on Ohms law will not work.)
Ok, so you could use a DMM, hundreds of charts and take hours to find Current or you could simply use an Amp Hound. This tool is quite simply the New Way to measure Current in an Automotive Circuit. You know, why use an abacus when you can use a calculator?