The P7 probe is pressure rated and can be entirely submerged up to 300m, so can be used to measure total well depth. The zero point on this probe is very near to the probe tip and therefore has near to zero displacement.
Size: 16mm x 137mm
Weight: 128g
The P7 probe connects promptly to the Tape seal plug of the Solinst PVDF Laser Marked flat tape used and, if required, the tape seal plug can be replaced with ease.
The P2 probe is used for tagging the water level and therefore should ideally not be submerged, but has a shielded design to significantly reduce false readings in descending water. The zero point is near the middle of the probe so more displacement may occur.
Size: 14mmx190mm
Weight: 200
The P2 probe is permanently installed onto the heat embossed high quality polyethylene tape.
Both use a flat tape which come with markings every millimetre or 1/1000 ft and have a thick dog-bone design to deter from attachment to wet surfaces.