GHM, Data Loggers, models:

Delta OHM HD50 Series	Operating Manual
Delta OHM HD50CR	Operating Manual
Delta OHM HD50CR-AS	Operating Manual
GREISINGER EASYLOG 80IMP Series	Installation And Operating Manual
GREISINGER EB log 80 K SMB2	Installation And Operating Manual
GREISINGER EB-Logg 80CL	Operating Manual
Greisinger EASYLOG 80BIN	Installation And Operating Manual