Hydroponic growers do not guess at nutrient strength — they measure it as electrical conductivity, because dissolved fertilizer salts carry current in direct proportion to their concentration. The SI unit is siemens per meter (S/m), but grow meters, lab equipment, and aquarium controllers almost always display microsiemens per centimeter (µS/cm), and the gap between the two trips up beginners constantly. The bridge is a factor of 10,000: multiply S/m by it to get µS/cm. Type 0.05 into the Conductivity (S/m) box and the Microsiemens per cm (µS/cm) readout shows 500 — a typical healthy nutrient solution — while the Mho per meter (℧/m) box echoes 0.05, since the mho is just the siemens' retired name. Lettuce thrives around 800–1200 µS/cm; push past 2000 and you risk nutrient burn. Pool testers and water-treatment techs use the same unit for total dissolved solids estimates. Whether the meter, the manual, or the forum post speaks S/m or µS/cm, this page translates instantly.

With the pre-filled defaults — Conductivity (S/m) 1 — the Electric Conductivity Converter returns Mho per meter (℧/m) 1.0000, Microsiemens per cm (µS/cm) 10,000.00. Change any input and those results update instantly, so you can see exactly how each number you enter moves the answer.