Recommended:
STANDARD BALLPOINT PEN, PERMANENT MARKER, PENCIL. NOT Recommended:
Slow Drying Inks.

Inside Ruler: Measure up to 20 cm.
Outside Ruler: Measure up to 8 in.

29 ruled lines. 1 header space.
Grid: 29 rows by 21 columns.

Illumination Baseline: 6 hours of glow with 20 seconds of flashlight exposure 3 inches perpendicular from paper surface. See Selective Illumination.

Engineered to be absolutely waterproof. Pages, Cover, and Spiral can be submerged for extended periods of time.

Book measures approximately:
5.8 in. by 8.3 in.
14.7 cm. by 21.0 cm.