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My TDS meter stopped working so I have thrown that away. I had another in my drawer so tried that and it looked like it was inaccurate reading 219 in the taiwan bee shrrimp water so I discarded that as well and ordered a new one which has arrived. I tried the new one and got a reading of 222 in that tank. When I did the usual weekly maintenance and partial change of water I made the usual RO (2 litres) which read TDS 000, and added 2 drops of GH+ and got a reading of 19 which seems to indicate the new meter is correct and accurate! If you are wondering why I am posting this, it is quite likely the old TDS meter was incorrect and therefore I am wondering if that is why the shrimp didn't survive as it was reading 140 but actually nearer 220? It also means the spare meter I had was probably correct but was thrown out, d'oh! I may try another batch of shrimp in the future, though a move is likely to happen in the near future so I may wait until that has happened! In the mean time I will try and double check this new tds meter is actually accurate, but it looks likely it is and, it was not a cheapie??