Rite in the Rain All-Weather Pen Refill No. 37R Black Ink Combat Training Aid ASP Lithium cells incorporate a

ASP Lithium cells incorporate a positive temperature coefficient (PTC) protection circuit and safety vent

complete with an extra hook and loop strap

and calibrated in both inches and millimeters with crosshairs at each end

distortion-free optics and all-day comfort

Differences from the classic Rocket™:

Rite in the Rain All-Weather Pen Refill No. 37R Black Ink Combat Training Aid ASP Lithium cells incorporate aRite In The Rain All Weather Pen Refill No. 37R Black Ink writes on wet paper and upside down in temperatures from 30F to 250F. It is ideal ball point pen for use in any situation or mission, including outdoors too. This Pen Refill is for use with fine Rite In The Rain All Weather Pen. Features of Rite in the Rain All Weather Pen Refill No. 37R Black Ink WRITES UPSIDE DOWNPressurized ink cartridge performs in temperatures from 30F to 250F, under water