BatteryStuff.com carries several quality battery load testers. Whether it is a simply analog battery load tester to your more advance Battery Conductance Analyzer. BatteryStuff.com has the battery load tester you need!
EZ Red 6v/12v Analog 100 Amp Battery Load Tester EZB1100
AutoMeter 6v & 12v Handheld 4 AH to 50 AH SLA Battery Tester