skip to Main Content
login to customer portal                request service                     contact us                  visit TPI worldwide  

390a Digital Salt Tester. Measure Total Dissolved Solids (TDS), salt and temperature for food, water quality and HVAC maintenance.

390a Salt Meter
390a Salt Meter

Easy-to-read LCD display. Measures temperature, TDS concentration and salt levels in solutions.

  • Water: Test TDS levels to determine purity
  • Food: Test the amount of salt in food, seafood, or processed foods
  • Health: Monitor the amount of salt intake
  • Water Filtration: Test for TDS to determine performance level of filtration systems
  • Pools & Spas: Monitor TDS levels to prevent maintenance problems
  • HVAC:
    • Test condensate water in cooling tower and humidifier reservoir applications to prevent bacterial growth
    • Test TDS levels in make-up water to prevent scale formation, corrosion, and embrittlement
    • Reduce water and chemical consump tion in boilers and cooling towers
    • Determine when to perform blowdown and add make-up water
    • Prevent contamina tion and corrosion of control valves, heat exchangers, and steam traps
    • Verify automated TDS contollers are functioning properly
    • Prevent low quality wet steam generation in boilers due to foaming caused by high TDS levels

£105.00 RRP exc. VAT

Where to Buy TPI Products

390a Digital Salt Meter. Measure Salt Concentration and Temperature.

  • The 390a measures the concentration of dissolved NaCl/TDS in liquids.
  • Simply immerse the tip into liquids to determine the NaCl/TDS content and temperature

What is TDS (Total Dissolved Solids)?
TDS is the sum of all inorganic particulate material.

  • Water contains a variety of minerals and salts, such as calcium, magnesium, carbonate, chloride and nitrate etc.
  • TDS is the parameter used when measuring the total sum of all these compounds in water.
  • TDS is an indicator used for wastewater analysis and measuring mineral content of water.


 Model 390a Specifications
 Salt Measurement  Measurement Method: Electric Conductivity Measurement System
 Range: 0.01% to 5.0%
 Resolution: 0.01% / 0.1%
 • 0.1% to 2% = +/-0.2%
 • 2% to 5% = +/-0.3%
 Temperature Range: 32°F to 212°F (0°C to 100°C)
 TDS Measurement  Range: 0ppm to 2000ppm (mg/L)
 Resolution: 1ppm (mg/L)
 Accuracy: ±20ppm
 Temperature Measurement  Range: 32°F to 212°F (0°C to 100°C)
 Accuracy: ±1°C (2°F) (temp. range 32°F to 158°F / 0°C to 70°C)
 Resolution @ 20°C  • Salt Measurement: 0.1%
 • Temperature: 1°
 Power Supply  CR2032 Battery (2)
 Size  10” x 1.3” x 0.7” (215mm x 30mm x 26mm)
 Weight  2oz (57g)
 Standard Accessories  Sensor protection cap, supporting spoon, manual and batteries

390a Digital Salt Meter Introduction Video

Product Documentationpdf-icon1

Click below to view or download product documentation PDFs:

390a TDS Product Sheet

390A Manual

Click on any image below for high resolution alternate product photography:

390a Salt Meter with Detachable Spoon
390a Salt Meter
Back To Top