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000 litres (4400 gallons)
then add TRACE supplements
and biological)
even when running at 100%
or potassium
HM Digital TDS-4 TDS Meter LED 000 litres (4400 gallons)Accurate & Reliable Water Quality Testing The HM Digital TDS 4 TDS Meter is a compact, handheld device designed to measure Total Dissolved Solids (TDS) in water quickly and accurately. Ideal for hydroponics, aquariums, drinking water, water filtration systems, and more, this easy to use meter delivers fast digital readings to help you monitor water quality with confidence. Key Features Measures Total Dissolved Solids (TDS) in ppm (mg L) Measurement