TEC-S311T Isotope Tandem Fob

IMPORTANT NOTE: This product does NOT include a tritium vial.

TEC-S311T Isotope Tandem Fob

The TEC-S311T Isotope Tandem Fob is designed to hold a glass tritium vial (sold separately) that glows continuously for years without requiring sunlight or UV light. Compact and stylish, this fob is an excellent way to add a luminous accent to your keychain or gear. With its shorter profile and dual split ring holes, the Isotope Tandem brings practicality and a subtle glow to your everyday carry items.

Switch up the glow colors anytime by replacing the vial—use different colors to identify various items in your setup. Add a touch of illumination to your keychain, backpack zippers, tools, or even ceiling fan pull chains. Pair it with a P-7 clip or your favorite pocket tool and explore the endless ways to use this versatile accessory.

Features:

• Custom-designed to hold a 3mm x 11mm tritium vial (not included)
• Made from durable stainless steel with a bead-blasted matte finish
• Available in stainless steel finish or TEC’s exclusive Black Diamond Finish
• Compact size compared to other Isotope models
• Dual split ring holes for versatile attachment

What’s Included:

• (1) TEC-S311T Isotope Tandem Fob
• (3) Rubber plugs for tritium vial containment (1 required, 2 spares)
• (2) 11.1 mm (7/16") split rings for easy attachment

Specifications:

• Material: Stainless Steel
• Finish: Bead-Blasted Matte or Black Diamond
• Outside Diameter: 5.0 mm [0.197"]
• Overall Length: 24.0 mm [0.95"]
• Split Ring Hole Size: 3.0 mm [0.118"]
• Weight (without tritium vial): 2.4 grams [0.085 oz]
• Weight (with tritium vial): 2.5 grams [0.09 oz]

Black Diamond Finish:

TEC’s Black Diamond Finish features a proprietary nano-composite microlayer for exceptional durability, low friction, and high corrosion resistance. This near-black coating provides a sleek, wear-resistant surface—perfect for fine personal accessories.

Upgrade your everyday carry gear with the compact, functional, and stylish TEC-S311T Isotope Tandem Fob. Where will you clip yours?