Pro underwater slate comes with both pencil clip and pencil tethered with latex tubing.  Slate is blank on both sides for maximum writing space.  Size is 4.5 in x 7.75 in.  Available with split ring, swivel clip (shown) or Snappy Coil (shown below photo) connections for attachment to BCD or other dive gear.  Also stows easily in BCD pocket. 

Webbing on swivel clip and Snappy Coil available in 6 popular colors.