Benchmade 983902F Field Sharpener
This sharpener by Redi-Edge is small enough to sit unnoticed on a keychain, or tethered around your neck. Has a 60-degree inclusive angle (often referred to as a 30 degree angle) that will easily touch up the edge of your blade anywhere, anytime without removing unnecessary blade material. This sharpener also has an area for honing as well as a v-notch to sharpen fishhooks or anything small and pointy.