Agreed, however I think a lot of the issues that people report are related to the probe calibration (done incorrectly) vs the accuracy of the probe itself. The probe that Neptune sells is "Lab Grade".
I currently have two tanks running, one with an Apex 2016 with the probe connected to it, and the second tank running an Apex Classic with a PM2.
I have calibrated both, they are spot on to either of the 2 refractometers that I have and that are calibrated, and do not fluctuate more than .5 over the course of the day.
This .5 variance in ppt translates to 0.679 uS/cm (conductivity). So I think if you calibrate the PM2 with the proper solution, it will be more than adequate to monitor TDS of RO/DI water.
On the plus side, using the PM2 vs the Hanna, if the TDS level were to rise, you would get an alert, where the Hanna would only shut down a device. Once you get the alert, you could
always verify by looking at the TDS monitor that came with the unit.
As to a probe holder... this would work.
Schedule 80 "T" 1/2" NPT (I know you're across the pond, but you get the idea!)
sch-80-tee-fpt-fpt-fpt.jpg
(2) 1/2" to 1/4" NPT reducer
202593-Schedule-80-Reducing-Bushing.jpg
Probe Holder
Probe holder.jpg
(2) RO/DI Tubing fittings
Mur-loc.jpg
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