Pen-Ray® field packs combine Pen-Ray® UV light source and DC power supply (with 9V battery) in a compact, portable package. These are lightweight (0.3 lb.) and small enough to fit in a pocket or to be carried by the belt clip attached to the power supply. These are available with a choice of options for customization or in three standard configurations. Lamp connector is located on the outside of the power supply for this configuration only. Other configurations come with the light source permanently connected to the power supply. FP-S Model. 3.75 L x 2.38 W x 1in H Power Suppy Dimension. 254nm Shortwave Light Source. 4.25in Lamp Length. 1.75in Lighted Length. 0.375in dia. Quartz/Handle. UVP® #: 95-0256-02.