The Wireless PTLevel is shipped with 13' of tubing, however upon request we can supply longer tubing.

The device can monitor up to 18' of water and anything deeper than that, water can enter the tubing and cause inaccurate readings. For deeper wells, we do have a custom device available but unfortunately it costs a lot more due to the materials. 

We highly recommend performing seasonal maintenance on your PTLevel, especially if you monitor tanks 13'+.

Also, the deeper the depth, the lower the resolution of the reading.