I purchased this calculator for office use.  I have had it for about 6 months now and have still not needed to change out the ink.  It works wonderfully.  It is durable, light-weight, and has large numbers for easy viewing.  Anyone can use it.  The only draw back is if you're not familiar with the functions of this type of calculator they do not give a great explanation on how to use it.  Otherwise, it works… read full review »