Load Testing and Conductance Testing

[Joe500]

I saw the sticky about evaluating batteries but I was wondering if any of the devices sold for testing would be helpful as a simpler alternative. There seem to be lots of 100amp testers selling for about $40. Are these helpful for house batteries? I've seen them used before to test marine batteries but their directions say that the load has to be equal to half of the CCA on the battery which is usually more than 100. Does anyone have experience with the Schumacher Speed Conductance tester which sells for $72? Generic System Error Test JSP (Item) This one claims to test without putting a load on the battery and handles a wide range of CCAs.