TDS Meter AP1
The AquaPro series is a line of handheld TDS/EC meters with a sleek design.
Measures total dissolved solids (TDS) and temperature.
Automatic Temperature Compensation (ATC)
Digital Calibration (push-button).
Auto-off function, data-hold function and low-battery indicator.
Display: LCD screen includes simultaneous temperature reading.
The AquaPro is calibrated with a 342ppm NaCl solution. The meter can be recalibrated with digital calibration using the push-buttons, rather than a screwdriver.
Includes a cap and batteries.
TDS Range: 0 - 5000ppm (mg/L).
Temperature Range: 0 - 80°C.
Temperature Resolution: 0.1°C.
Accuracy: +/- 2%.
EC-to-TDS Conversion Factor: NaCl (avg. 0.5).
Power source: 1 x 3V button cell (model CR2032).
Dimensions: 15 x 2.8 x 1.3cm.
EC, TDS and CF in Hydroponics:
EC is an indication of how much resistance is in the solution. The more nutrients in the solution, the higher the EC. EC is often converted into PPM (parts per million), which is only an indication of TDS. CF is simply the European standard of measurement. An EC measurement is simply multiplied by 10 to reach the same CF. However, because the standards differ slightly, they use different conversion factors to reach TDS. For ease of use as well as accuracy, PPM is commonly used in hydroponic cultivation, however, it is an EC parameter that has been multiplied by a conversion factor. Usually, the EC meter will do the conversion automatically, however, some meters may only show EC. You then need to find out which conversion factor applies to that meter and apply it.
Plants require increasing amounts of nutrients as they grow, but will decay if the solution is too strong. It is always recommended to monitor the plant for signs of nutrient deficiency or nutrient burn and adjust the feeds accordingly.
Click here for more info on EC, TDS and CF.