This just popped up - no reserve
eBay Autometer 800 amp tester (http://www.ebay.com/itm/AUTOMETER-SB-5T-BATTERY-TESTER-AMP-METER-NO-RESERVE-/371524719466?hash=item568099536a:g:SogAAOSwk1JWfF41&item=371524719466&vxp=mtr)
Cooling fan looks a little rusty, maybe some water damage?
Moist air being drawn across the fan blades?
that fan looks like it is plastic/nylon to me !!!!
JohnH