The Presidium PDT tester includes 7, 0.5 ct diamond size equivalents of these simulants: Strontium Titanate, 

Cubic Zirconia, GGG, High Zircon, YAG, Synthetic Sapphire, and Synthetic Spinel.

These simulants are not required for testing, and are used for Reflectivity Meter part calibration and as a reference. 

They are valued at $180+ if sold seperately, and are not included in the PDT-S7 model of this tester.