Red LED Pen

My boss got me several of these (and a few more, when the batteries on one went out). But he can’t remember where he got them. Sigh. They work great for copying down clearances at night, etc. They’re not quite perfect; the clicker at the top of the pen controls the light, and the ballpoint end is extended/retracted by twisting the barrel. But if you can live with that, and if you can find them, maybe you can call on, the Red LED Pen: