To provide a bit of balance regarding the KHD:
- It is consistent in its readings when set up correctly (if it is 0.4 DKh out, then who's to say that the other test method is correct and, even if it is, you can program an offset so that they match).
- My vent output doesn't leak.
- The setup videos are great, and are about as comprehensive as you could possibly get (I didn't find it particularly hard to set up).
- I haven't cracked anything on my unit.
- My PH probe doesn't leak.
- If you're worried about it leaking then you can put it at the bottom of the stack.
- Extremely well built.
- Dosing pumps are possibly the best available on the market.
I'm sure Focustronic customer service would come up with a quick search.
(p.s. Mastertronic and KH Director do different things. There is no such thing as a GHL Director, just the KH Director and ION Director).