This Pen-Ray® CP series calibration lamp is manufactured from the highest grade of quartz and mercury components. Provides the full mercury spectrum. Requires 44-0002-01 DC power supply. Extremely small dimensions without handles for portable and/or limited design space applications. 1.85in Length. 254nm Shortwave UV Source. 0.06in Lighted Length. 0.375in dia. Quartz. UVP® #: 30-0057-01.