With this sensor holder, you can attach up to 6 sensors to your aquarium.The holder is suitable for vertical as well as horizontal fitting. For wall-thickness up to 16 mm.
How accurate a measurement is depends, among other factors, greatly on the calibration. Precondition for good calibration is precision calibration-solutions. Available1 mS/cm (1000 µS) oder 50 mS/cm, with 50 ml content/each.