The PTLevel (Long Range Wireless and Wired WiFi) 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 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.