Reizen Large Format Calculator Keyguard (#512)

This keyguard is for the Reizen Jumbo Talking Calculator #752975.  It is available in several materials and is secured with Velcro fasteners (shown).

Most users will prefer the 3/16" thickness.  1/4" thickness is good if you want deeper holes, requiring a more deliberate touch.  You might want 1/8" holes for someone who can type faster, but just needs help touching only one key at a time.