Monday, 8 December 2025

A TDS meter in PPT (parts per thousand) measures the concentration of dissolved solids, acting as a higher-range version of the common PPM (parts per million) meter

 A TDS meter in PPT (parts per thousand) measures the concentration of dissolved solids, acting as a higher-range version of the common PPM (parts per million) meter, automatically switching to PPT for very high concentrations (around 1000 PPM = 1 PPT) for easier reading, and is used for industrial, aquaculture, or high-concentration water quality checks. These meters offer ranges like 0-10 PPT or 0-1000 PPT for high-end applications, providing crucial data for industries needing precise measurements beyond standard potable water levels. 

Key aspects of TDS meters in PPT:

Measurement Scale: While PPM is standard, PPT (parts per thousand) allows for manageable readings when solids exceed PPM capacity (e.g., 1500 PPM becomes 1.5 PPT).

Automatic Switching: Many digital TDS meters automatically convert from PPM to PPT when readings get high (above ~1000 PPM) for display convenience.

Applications: Used for measuring salinity, highly concentrated industrial wastewater, or high-end aquaculture/hydroponics where TDS levels are significant.

Examples: Meters like the Manti MT-116 (0-1000 PPT) or Eutech TDSTestr High (up to 10.00 PPT) are available for these needs. 

How it works (PPT vs. PPM):

1 PPT = 1000 PPM (or 1 gram per liter).

A meter reading 2.5 PPT is equivalent to 2500 PPM. 

In essence, if your water sample is very salty or has a high mineral content, a PPT-capable TDS meter simplifies readings by converting large PPM numbers into smaller, more readable PPT values. 

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