G&R Labs and the Autodesk Ember folks specifically designed this UV light meter, the Model 222, to be used in conjunction with the Ember 3d printing system. The Model 222 is the standard measurement instrument to monitor the Ember’s UV light source output in both intensity (mw/cm2) and energy (mj/cm2).
Stratsys/Object contacted G&R Labs seeking a UV light meter designed specifically for their 3d printer products. The Model 221 was created and became the Stratsys/Objet standard measurement instrument when monitoring the UV light source intensity and energy.
A tutorial on UV light waves.