{TAIL ~ A device} for testing a battery, particularly a small, portable battery, comprising a flexible, transparent substrate on which is deposited a narrow band of {HEAD ~ a black light} absorbing material 
{ TAIL ~ A device } for testing a battery , particularly a small , portable battery , comprising a flexible , transparent substrate on which is deposited a narrow band of { HEAD ~ a black light } absorbing material
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 OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH