My Hach HQ40D doesn't recognise my new ORP probe? - The Laboratory People
Hach 251235 CEL Advanced Drinking Water DR/900 Colorimeter Laboratory Kit HQ40d – Rhino Trade LLC
HQd Portable Meter
HQ40D Portable pH and Conductivity Meter, Laboratory Kit for Water Quality, with Refill pH Electrode and 4 Poles Graphite Conductivity Cell, 1 m Cable | Hach - Overview - Obsolete
HACH HQ30d flexi Portable meter with HACH LDO 5 m cable | eBay