PST™ sensors have a very unique capability not found in any other sensors available on the market today.  They can identify liquids and potentially gases (future) inside a closed container, pipe, or vessel without coming in contact (non-intrusively) with the liquid or gas.  The value of this capability is high due to the reduction in installation time and costs vs other technologies which must be in contact (intrusive) with the process liquid or gas.  Products which require intrusive installation also cost downtime for installation and this is not always very easy to schedule downtime for large equipment, vessels, tanks, or pipelines when they are used for daily operations which are revenue generating.  Secondly, this requires all components of an intrusive sensor to be chemically compatible with the process liquid or gas.  It further creates potential leak points which in turn create environmental concerns.