The QX-102 Calibration Capsule is a QX-102 Capsule that has been specially designed to assist first time users in finding optimal imaging conditions for WETSEM® imaging in their SEM . The Calibration Capsule contains nanoparticles of two different sizes; 40 and 500 nm. The particles are easily visualized in an SEM and provide a convenient means to calibrate the parameters for optimal wet imaging conditions.