{HEAD ~ The tester} 25, wherein said liquid crystal is selected from the group consisting of cholestery chloride, {TAIL ~ cholesteryl oleyl carbonate}, cholesteryl bromide, cholesteryl acetate, cholesteryl nanoate, cholestery oleate and cholesteryl caprylate 
{ HEAD ~ The tester } 25 , wherein said liquid crystal is selected from the group consisting of cholestery chloride , { TAIL ~ cholesteryl oleyl carbonate } , cholesteryl bromide , cholesteryl acetate , cholesteryl nanoate , cholestery oleate and cholesteryl caprylate
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH