Water Filter, Reverse Osmosis System, Reverse Osmosis Pressure Tank, Water Filtration Systems
Toll Free: 877-541-6603
Open 9 AM - 5 PM PST Mon-Fri
Quick Order

If you already know your part numbers, simply enter them below along with the quantity desired and click Add to Cart for a speedy check-out.

Enter Part Number:Qty.

Newsletter Signup

Join our newsletter list to get the latest updates


Contact Us

TOLL FREE: 877-541-6603


Home > Testing & Monitoring Equipment > HM Digital Water Quality Meters

HM Digital (TDS-4) Handheld Digital TDS Meter/Monitor

HM Digital (TDS-4) Handheld Digital TDS Meter/Monitor


Retail Price:: $26.88

Your Savings:: $5.88

On sale: $25.00$21.00 On Sale


Availability: Ships Same Day!

Choose Options

Quantity Discounts
Quantity Price
2 - 4 $19.95
5 - 9 $18.80
10+ $17.85


Ideal for all water purification applications, wastewater regulation, aquaculture, hydroponics, and colloidal silver.

  • Includes an internal digital thermometer (Celsius).
  • The smallest and lightest TDS meter available on the market.
  • Hold Function - Saves measurements for convenient reading and recording.
  • Auto-off function - Turns off meter after 10 minutes of non-use to conserve batteries.
  • Dual Range - Measures from 0 - 999 ppm, with a resolution of 1ppm. From 1000 to 9990 ppm, the resolution is 10 ppm, indicated by a blinking 'x10' image.
  • Factory Calibrated: our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver.
  • Recommended for aquariums & aquaculture, horticulture & hydroponics, pools & spas and water cooler professionals.

Related Info



Questions & Answers

Q: When the TDS reads 4.96 what does that mean in PPM?
Asked by:  - 4/14/2014 (Submit an answer)
A: This means that there is 4.96 dissolved solids in the water.
Was this answer helpful?  0 of 0 Customer(s) found this Answer helpful.
Answer provided by:  
Q: Good morning, Will this TDS accurately measure the salt level in my salt-chlorinator pool system?
Asked by:  - 6/10/2014 (Submit an answer)
A: Yes it will technically measure the salt level, but it will also measure everything else in the water. Hence, one would not be able to tell the actual salt level measurement in the water.
Was this answer helpful?  0 of 0 Customer(s) found this Answer helpful.
Answer provided by: