Fisher Space Pen Trekker 4 Inch Black with Keyring Cap

The Fisher Space Pen Trekker is a compact writing tool that closes to 4 inches and splits into two pieces with an integrated keyring cap for portable carry. It uses a black ink medium point cartridge and writes reliably underwater, upside down, at any angle, over grease, and in extreme temperatures—conditions that disable conventional pens. This makes it practical for outdoor work, field conditions, and situations where ordinary ballpoints fail.