The HM Digital TDS meter is a must for reverse osmosis (RO) filter and membrane monitoring. Know when to change your pre-RO filters to extend the life of the RO membrane. Designed for home use, this pocket TDS meter comes with a 2 year limited manufacturer's warranty.

HM Digital Inc., TDS-4

Designed for the long haul, this compact TDS (Total Dissolved Solids) meter has been manufactured with a tough housing and large, easy to read LCD screen. It sports a measurment range of 0 to 9990 parts-per-million.

The TDS-4 is perfect for monitoring your reverse osmosis (RO) output water. Take the guess-work out of knowing when to change your filters!

$42.89

What Is TDS?

Total Dissolved Solids (TDS) are the total weight of all solids (minerals, salts or metals) that are dissolved in a given volume of water expressed in milligrams per liter (mg/L), or in parts per million (ppm).

The lower the TDS level in the water, the more efficiently your body's cells actually get hydrated by the water you drink.

The higher the TDS level in the water, the greater the probability of harmful contaminants that can pose health risks or hinder the absorption of water molecules on the cellular level.

The EPA's Maximum Contaminant Level of TDS in secondary drinking water is 500 mg/L (500 ppm).

Use The TDS Meter To:

• Check the performance of your water filter
• Check for hardness (1 grain = 17ppm)
• Prolong the life of your reverse osmosis membrane by monitoring the output
• Make sure you always drink pure water

Features

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 1 ppm. From 1,000 to 9,990 ppm, the resolution is 10 ppm, indicated by a blinking x 10 image.