Atlas Material Testing Technology offers services to evaluate the performance, durability and reliability of solar cells and modules at its ISO 17025-accredited laboratory. There are testing programs for full-scale photovoltaic (PV) arrays, building-integrated PV systems, complete modules and individual PV cells. The company has developed the XenoCal solar sensor for UV preconditioning of PV modules. It measures irradiance (W/m2) or radiant exposure (kWh/m2). Depending upon which IEC standard is selected from the menu, values in two wavelength bands are displayed. The watertight sensor can operate in harsh environments and is supplied in a case with a lithium battery, a connecting cable and an RS-232 interface. Processing software can be downloaded free from the company’s Web site.