HP, Multimeter, models:

3438A	Operating & Service Manual
34401A	User Manual
3457A	Service Manual Operating Instructions Manual
3466A	Operating And Service Manual
8153A	Operating And Programming Manual
971A	User Manual
972a	User Manual
974A	User Manual
E1326B	User Manual
E1410A	Service Manual
E1411A	Service Manual
HP34401A	User Manual