You may purchase any of the digital items for your account after logging in.
| PAIR TEST MATERIALS | |
| 1. PAIR STARTER PACKAGE: $ 29.00 | |
| 
 | |
| 2. PAIR TEST CREDITS (TWO): $ 10.00 | |
| 
 | |
| 3. PAIR TEST CREDITS (TWENTY): $ 90.00 | |
| 
 | |
| 4. INTERPRETIVE MANUAL (DIGITAL COPY): $ 15.00 | |
| 
 | |
Non-profit agencies, universities, and researchers may be eligible for discounted or bulk rates. Please contact us for details.