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Which TDS meter

I would go for
https://smile.amazon.co.uk/dp/B01FXRC354
(Assuming you actually get a HM TDS3).

I have had these and they work well and are accurate (and can be calibrated). I did assume they were generic Chinese rebrand items and bought another that looked identical but was a few £ cheaper. This was designed to look just like the TDS 3 but was basically a random number generator. I tried in in a reference 342 solution and got readings of 180, 250, 400.... The deionised water read anything from 50 to 150 (when it was 0).

Only problem with these was me.... They don't like getting wet beyond the sensor. I now have one of these (https://smile.amazon.co.uk/dp/B000VVVEUI) which isn't cheap but is very reliable and waterproof!
 
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