Digital Water Tester
HM Digital TDS-3 Water Tester
HM Digital TDS-3 Water Tester £25Total Dissolved Solids (TDS) is a general measure of water quality. It measures the presence of minerals, salts, metals, cations, anions and any other chemical dissolved in water. These foreign bodies are measured in Parts per Million (ppm).
Simply pour a glass of water and place the TDS reader into the glass and use the chart below to monitor the quality of your water.
Used in a variety of commercial situations it is also perfect in the home to check the effectiveness of reverse osmosis systems and for knowing when to replace filters.
The TDS comes with a vinyl leather carry case and belt clip and includes a digital thermometer.
"Dissolved solids" refer to any minerals, salts, metals, cations or anions dissolved in water. This includes anything present in water other than the pure water (H20) molecule and suspended solids. (Suspended solids are any particles/substances that are neither dissolved nor settled in the water, such as wood pulp.) In general, the total dissolved solids concentration is the sum of the cations (positively charged) and anions (negatively charged) ions in the water. Parts per Million (ppm) is the weight-to-weight ratio of any ion to water. A TDS meter is based on the electrical conductivity (EC) of water. Pure H20 has virtually zero conductivity. Conductivity is usually about 100 times the total cations or anions expressed as equivalents. TDS is calculated by converting the EC by a factor of 0.5 to 1.0 times the EC, depending upon the levels. Typically, the higher the level of EC, the higher the conversion factor to determine the TDS.
NOTE - While a TDS meter is based on conductivity, TDS and conductivity are not the same thing
TDS range: 0-9990 ppm
Temp range: 1-80 deg C Accuracy: +/-2%
Resolution: 1 ppm
Power Source: 1 x 1.5V "button cell"
Weight & dims: 77 g (with case) & 155 x 3.1 x 2.3 cm