The user's manual for the Casio HR-100TM calculator is not available online at the Casio website, as of March 2015. Users can contact Casio by using the feedback website or by calling Casio technical support at 1-800-435-7732 toll free to have a hard copy mailed to them.
If the user chooses to use the Casio feedback website, the user should select Request Manual for the Topic box, Calculators for the Category box and enter the model number, which is Casio HR-100TM. The user also needs to provide name, email address, and ZIP code.
Casio technical support is available from 9 a.m. to 8 p.m., Monday to Friday, and from 10 a.m. to 8 p.m., Saturday and Sunday.