Excellent for marking various substrates that are to be radiographed. High energy level pen has a higher strength emission signal than the normal energy pen and a slightly longer duration of signal emission time than the 3-4 minutes of the normal energy pen. Bright green markings are visible under normal conditions, do not glow in the dark and will show up on x-ray film. The spectral peak is 5600 Angstroms. They incorporate a non-toxic phosphorescent substance that will not leak or dry out. There are no vials or bladders and no liquid to spill. The non-radioactive energy emitted may be adjusted by exposure to normal incandescent or flourescent white light. Pen is 4.5" (11.4cm) long with a pocket clip. A screw knob advances the writing tip. Reverse the screw knob and press tip to surface to retract. Not appropriate for phosphor screens. Sold per each.
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