Prism, tonometer for the slit light ophthalmic end item nsn 6540-01-520-7942. Found in army assemblage n315, medical materiel set eye exam clinic: depmeds
NSN 5835-01-171-0258
NSN 5835-01-261-2978
NSN 5930-00-581-0939
NSN 5950-01-241-9890
NSN 5935-01-012-1850
NSN 5965-01-472-3664
NSN 5920-01-422-4790
NSN 6150-00-821-2847
NSN 5985-01-544-4816
NSN 6645-01-324-1956
NSN 6135-00-097-8162
NSN 6685-01-440-1844