A core orientation tool used in geological core drilling

Borehole surveying instruments; data collection instruments; detecting instruments, other than for medical use; electronic image processing instruments; electronic image recording instruments; electronic navigation instruments; instruments adapted for use with computers; instruments for indicating directions; instruments for indicating planes; instruments for measuring angles; instruments for measuring gradients; instruments for measuring pressure; instruments for surveying physical data; levelling instruments; levelling staffs (surveying instruments); levels (instruments for determining the horizontal); measuring instruments; research instruments for scientific use; scientific apparatus and instruments; surveying apparatus and instruments; surveying instruments; temperature measurement instruments; time recording instruments; wireless instruments; all the foregoing being in relation to boreholes, drilling, coring, downhole surveying, underground resource exploration and surveying, geological exploration, geological surveying and geological research; apparatus and instruments, electronic or mechanical, to record information relating to geological core samples and boreholes; apparatus and instruments, electronic or mechanical, to record orientation of borehole surveying tools; apparatus and instruments, electronic or mechanical, to record orientation of rock core samples obtained by drilling operations

A core orientation tool used in mineral exploration core drilling