http://www.simplyscuba.com/products/SubGear/WristSlates.aspx
The Sub Gear Wrist Slates can be attached easily to your wrist via a velcro strap. It features 3 slates on a hinge, which are all plain on one side and features some of the most commonly used questions and instructions on the other side of each slate. It also has an attached pencil on an elastic cord to avoid loosing it.

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