The Omnitester should work just fine. Measure atty ohms, battery voltage, and battery voltage under load all in one
device. An all-in-one device that's easier to use than a digital multimeter.
It's true it only reads to 0.
X a tenth of an ohm and won't display 0.0
X hundreths of an ohm. If you're running below 0.2 ohms, well .... I'm not going to get into that discussion here.