{TAIL ~ The sensing element} can include a water permeable material positioned in between {HEAD ~ two water impermeable material} 
{ TAIL ~ The sensing element } can include a water permeable material positioned in between { HEAD ~ two water impermeable material }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD