Hach, Controller, models:

AS950 AWRS	Quick Start Manual Operation Manual Basic Operations
CD500	User Manual
EC1000	Instruction Manual
LXV525.99A15551	User Manual
ORBISPHERE 366 Series	Basic User Manual
ORBISPHERE 410	Quick Operator'S Manual
Polymentron 9500	Basic User Manual
Polymetron 9500	User Manual
SC1500	User Manual
SC4200c	Basic User Manual User Manual
SC4500	Basic User Manual User Manual
sc100	User Manual
sc1000	User Manual
sc200	Software Update Basic User Manual