[Ronbo]

The carbon pile testers are more, ($150 and up) they typically do a 500A load. The "toaster" one like I posted does a 100A load test, which is actually better since you can use it on smaller batteries. (like lawn mowers and such) Just takes a little longer to run down the big batteries.

I've got an old Schumaker one that I bought about 30yrs ago (paid about $40 back then for it).