Tele indication via 10” Touchscreen display for the indication of the water values in areas of swimming pools that are accessable by the public. Thus bathing guests can convince themselves of the perfect quality of the swimming pool water. Besides the indicated hygiene parameters free chlorine, pH and redox the water temperature is shown too. Furthermore the operator of the pool can use the display for the information of his guests (e.g. bathing rules, advertisement). The water values and the stored guest information are shown alternating in a slideshow.