I am selling my KH director. It is almost two years old but only used six to eight months. The head covers on the doser have been replaced with the newer ones, the old ones caused the doser to stick. i have a unused pH probe that was purchased 6 months ago along with a reference solution and reagent. I am asking $450.00 for both, not interested in parting right now. I do best responding to pm’s. Price includes shipping.