Yeah, any car load tester will work. The difference is the amp rating on the battery. Car and MC batteries are all 12 volt, but a car battery will have more stored amps than a MC battery. Ten to fifteen seconds of load, in the good zone, and you are good. If it fails, you can double check the electrolyte with specific gravity/electrolyte tester. But if the load test fails, it don't matter which cell is low. The battery needs to be fully charged to test with the load tester, or it will fail every time. Let sit overnight after the test, and test the next day, for testing drainage.
Cool shovithead...I was gonna buy one today but the auto parts guy kinda talked me out of it...just wanted a second opinion before I went on believing him..Looks like Ill pick one up..I think it will come in handy once in a while..