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PH Pen Storage Fluid
- Thread starter AverageWhiteBloke
- Start date
Andy Thurston
Member
- Joined
- 16 Apr 2013
- Messages
- 2,804
Not that wierd. tds pens are used to measure purity of ro water which lets you know when membranes need replacing
Now I re-read my comment it's ambiguous to say the least.
He does pH pens, he does TDS pens. To buy the two together is a weird deal. The pens separately come to £9, but posted about £16. Together they're £12 and postage makes them £15.
He does pH pens, he does TDS pens. To buy the two together is a weird deal. The pens separately come to £9, but posted about £16. Together they're £12 and postage makes them £15.
