Streamlight 3V Lithium Battery 2/PK

Lumens and candela both describe light output but measure completely different things. Here's what each spec actually tells you, how beam design connects them, and which number matters most for home defense, hunting, and handheld use.

Both are invisible to the naked eye and both are used with night vision — but IR lasers and IR illuminators do completely different things. Here's what each one actually does, when you need each, the civilian legal landscape for IR lasers, and what to look for when buying.

Technology Explained Summary: At distance, environmental conditions determine where your bullet hits. Here's what Kestrel weather meters actually measure, why it matters for hunters and long range shooters, and how to choose between the entry-level units and the flagship Applied Ballistics models.