HM Digital Triple Inline RO/DI TDS Monitor with 1/4 inch T-Fittings

Nice piece of kit. needed this cos i upgraded my RO system to a two-way tap for Drinking water(remineralised), and Kettle water(0 ppm). this meter lets me keep an eye on the ppm of the three stages - Incoming mains, after resin, after remineraliser. Nice. bit on the pricey side, but couldn't find any one else selling one with the three stages.

Using this for Monitoring a four stage reverse osmosis filter.Delivered quickly. Easy to fit ,does the job as required.

I use this to measure the TDS before the RO mambrane which is usually around 250-270ppm, after my RO membrane which is about 12-15ppm and after the 4th stage (DI), which is usually 0-3ppm. In this case I can know when I have to replace the filters. If I will notice an increase of TDS in any step, that means one of the filters needs to be changed.

item does not show correct TDS for one of the stages correctly an have tested it using other two probes, was saying TDS was 0 but other probe said 4 and the other said 4 so one is now faulty which was needed to check for TDS levels at each stage on my 6 stages.

Very easy to fit. Good instructions

Perfect and as described, works perfectly and would recommend this over having a 2 stage TDS meter.

Firstly I purchased this from the seller Realgoal which Amazon fulfilled, so I can’t be sure if it applies for the other sellers.For correct installation the probe is inserted into the Top of the T connector, correctly installed you should be able to see 2 probes when looking through the In & Out side of the T. This allows water to flow through the 2 pins giving you a accurate reading of TDS in your water.This is not the case with all 3 supplied T connector.1. The problem is the supplied T doesn’t allow you to push the probe deep into the T, not making a connection. This is simply the design of the T as it hits plastic and you can’t force it any further.2. By not allowing you to push in the probe fully, the O rings doesn’t create a tight seal, under pressure it caused a streamed leak.Which is seen in the photo.Amazon were good enough in giving me an option of a £10 credit towards purchasing 3 correct T’s or a full refund. I went with the latter and purchased a 2 sensor unit from a Vyair, probes fitted perfectly into the T and works as intended.

I had a dual meter that worked well for a few years. This triple meter seemed to be similar quality, but the valves for the probes seem to be slightly different and the probes dont fit properly/are too tight.They do however fit in the valves for the old dual monitor so decided to use those rather than grief of returning and just have a redundent third probe. Others ordering may not have spares handy.