TDS Meter
December 22, 2007
A TDS Meter measures the amount of Total Dissolved Solids (TDS) in a solution. Since salts and minerals contribute to the conductivity of a solution a TDS meter often measures the Electrical conductivity of the fluid which is then converted to a TDS reading.
For example:
1 mg table salt/liter of distilled water = 1 ppm TDS
[...] time to time to remove salt accumulation. This may be checked with an electrical conductivity or TDS meter, a good average reading would be about 1500 ppm TDS. Lettuce grows well at about 800 ppm and [...]