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