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AQUA MEDIC PH CONTROLLER WITHOUT SENSOR The pH controlleris a precision instrument for controlling the pH value in aquaria. In combination with a CO2system and a solenoid valve the pH can be maintained at a constant level, and the CO2supply to aquatic plants can be controlled. The unit is supplied with a large LED display and the control range is digitally adjustable from pH 3.5 to 10.5.The direction of adjustment can be set up or down.ThepH controllerhas a BNC connection for pH electrodes.The use of an original Aqua Medicplastic shafted electrodeis recommended.