Four electronic calculators—TSI Speech Plus, Master Specialties ARC 9500, AFB MAS 200, and Science for the Blind CALCU-TAC T8B—were evaluated by seven visually impaired persons. Though the models varied in availability of functions and type of output (voice, braille cell, braille tape), all were deemed usable. Purchase decisions should therefore be made only after careful consideration of the user's requirements. With the exception of the CALCU-TAC T-8B, all tape instructions were judged adequate for orienting the novice. Some difficulty was experienced in remembering long strings of digits, and strategies were developed to cope with this problem.
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