On CLEP exam day, test takers aren't allowed to bring their own calculators into the testing room. Because of this, calculators are integrated into the CLEP exam software to help test takers solve questions on some CLEP science and math exams and the Financial Accounting exam.
To practice using these calculators, visit the ETS Calculator Practice page. Select the appropriate exam from the dropdown menu. Here's more examspecific information:

Calculus
A graphing calculator, the TI84 Plus CE, is available to students during Section 2 of the CLEP Calculus exam. Only certain questions require this calculator. 
Chemistry, College Algebra, and College Mathematics
A scientific (nongraphing) calculator, the TI30XS MultiView, is available to students during these exams. Students are expected to know how and when to use the calculator. 
Financial Accounting
A fourfunction calculator is available during the exam as part of the testing software. Because the use of this calculator is straightfoward, it's NOT covered by the ETS Calculator Practice page. 
Precalculus
The TI84 Plus CE graphing calculator is integrated into the exam software. It's available during Section 1 of the exam. Only certain questions require this calculator.
Visit the CLEP Exams Overview page for details about each exam and the types of questions that may require a calculator.