Amtra Refrectometer Option 1:-- Unlike liquid fertilizers which dose

Unlike liquid fertilizers which dose the water column

Does not retain hair and impurities

Due to destabilizing factors (including overfeeding

sera pond pump PP 12000 (powerfull and energy saving feed pump in a beautifully shaped basket)

The function of this thermostat is far more sophisticated than the simpler on/off switching devices

Amtra Refrectometer Option 1:-- Unlike liquid fertilizers which doseAMTRA LED OPTICAL REFRACTOMETER optical refractometer for measuring salinity in the marine aquarium with integrated LED Features: Practical optical refractometer for measuring salinity in a marine aquarium equipped with LEDs for better reading of values and with automatic temperature compensation (ATC) Thanks to the supplied LED, you can comfortably read the measured value in any external light situation Possibility of re calibration Integrated