DIVER/MATIC is a portable signalling apparatus, visual and acoustic, for the gauging of the water level in a borehole. DIVER/MATIC is equipped of a metric cable, number by a 0-200 m scale and roll up cable with bracket. For its working and power supply it is enough a standard 9 Vcc pile, included with the device. Thanks to the indelible marked metric numeration on the cable sheath, it is possible to read the distance from the water surface by means of the bipolar probe, which provides to turn on a LED and its relative acoustic signal. Probe Ø 16 mm 120 mm length