Grade 5 titanium · Sealed Swiss tritium

Find your gear
in the dark.

A titanium glow pendant powered by sealed tritium — no battery, no charging, always visible for up to 25 years. Clip it to your backpack zipper, keys, pouch or EDC setup and find it instantly in low light.

Pendant $59.00 · Vials from $8.90 · 30-day returns
Shop Glow Fob Buy Tritium Vials
No battery No charging 25-year glow Grade 5 titanium
Why you want one

Tiny light. Huge difference at night.

01

Backpack zipper

Spot your bag instantly in a dark room, tent, trunk, or overhead bin — the glow marks it for you, every night, for decades.

02

Keys & EDC

No more patting pockets or sweeping the nightstand. Your keys announce themselves the moment the lights go out.

03

Outdoor & travel

Always-on visibility with zero electronics — nothing to charge, break, or forget. It works because physics works.

The lineup

Choose your glow setup.

One pendant, raw vials, or a matched pack — everything ships glowing and stays that way for 25 years.

P/N 001

Tritium VialsFor modders, makers & replacements

Raw sealed vials for knife makers, watch modders, keycap builders — anyone who works after midnight.
$8.90From · single vial
Choose Size
Best seller
P/N 002

Titanium Glow PendantBest for keys, backpacks & EDC

CNC titanium, chamfered and bead-blasted, tritium installed. A quarter century of glow on your chest.
$59.00Vials installed
Shop Now
P/N 003

Builder PacksMatched color sets for projects

One color, one size, one production run — brightness-graded so every vial in your build glows the same.
$39.00From · 5-pack
Build Your Pack
Vial configurator

Pick a size. True scale.

FIG.1 — GTLS VIAL, SECTION A-A
REV. C
22.50 MM
⌀ 3.00 MM
Borosilicate glass
laser-sealed
Phosphor lining
ZnS : Cu
Color —
Five sizes — drawn to true relative scale · all dimensions as machined
Colorways

Choose your glow color.

Every color is a different phosphor chemistry with its own honest brightness. Tap one — the whole page relights so you can feel it before you buy.

The reference. Green phosphor converts decay energy most efficiently — the brightest glow a vial can make, and what the human eye sees best.

GREEN — 525 NM
FIG.4 — PERCEIVED BRIGHTNESS
EYE-CIE

Among the standard colors, green is perceived by the human eye as the brightest. Due to differences in phosphor efficiency and visual perception, the other colors appear dimmer by the amounts below. For maximum visibility in low light, Green and Yellow are the strongest choices.

Green100%
Yellow90%
White60%
Orange50%
Ice Blue40%
Pink20%
Red20%
Purple15%
From the night shift

Carried daily. Reviewed nightly.

★★★★★

"Clipped it to my camera bag zipper. Walked into a pitch-black venue, found my bag in two seconds. That alone was worth it."

Mark T. · Verified buyer
★★★★★

"The titanium finish is nicer than photos show. And there is something oddly comforting about a light that literally cannot die on you."

Sofia R. · Verified buyer
★★★★★

"Bought vials for a knife build. Batch-matched brightness is real — all five glow identically. Will be back for the pendant."

Dylan K. · Verified buyer
The engineering

Why it never needs you.

0YRSContinuous usable glow
0YRSTritium half-life
0EVERBatteries required
FIG.2 — RADIOLUMINESCENCE PRINCIPLE, SECTION B-B
REV. A
³H → ³He + β⁻ + ν̄ₑBeta-minus decay — the only reaction inside
Beta energy5.7 keV avg · 18.6 keV max
Half-life12.32 years
Range in air≈ 6 mm, then absorbed
Gamma emissionNone
Light conversionβ⁻ → ZnS:Cu lattice → photon, 525 nm
Output stabilityContinuous · temperature-independent
Every second, ~10⁹ electrons strike the phosphor wall — each impact is one photon of the glow you see

The gas decays

Tritium releases one soft electron per atom as it becomes helium. Cold, water, vacuum, neglect — nothing pauses it.

The wall lights up

Each electron strikes the phosphor lining, which converts the energy directly into steady visible light.

The glass holds

Laser-sealed borosilicate keeps the gas in for life. The electrons can't pass glass — or even paper.

Time barely shows

Half-life 12.3 years: the glow dims gently over decades instead of dying overnight. Useful light past year 25.

Peace of mind

Sealed. Safe. Proven.

The tritium is sealed inside a glass vial for life — no charging, no electricity, no sunlight needed. The same self-powered glow technology has been trusted in watches, aircraft instruments and emergency markers for decades. Here's the proof, on paper.

FIG.3 — β⁻ PENETRATION TEST
PASS
Test 1 — Vial wallBorosilicate, 0.5 mm
Test 2 — Open airNo barrier at all
Test 3 — Your skinDead outer layer only
Result: 0.000% of beta radiation reaches living tissue — it never gets past its own glass
Annual dose, compared
Wearing a tritium pendant, 1 year≈ 0 µSv
Eating one banana0.1 µSv
One transatlantic flight≈ 50 µSv
One chest X-ray≈ 100 µSv
Natural background, 1 year≈ 2,400 µSv
* External dose from an intact GTLS vial is effectively zero — the beta particles are fully absorbed inside the sealed glass.

No gamma. No alpha.

Tritium emits pure low-energy beta — the softest radiation in the isotope catalog. Nothing that penetrates, nothing that accumulates in the vial's surroundings.

Even if broken

Tritium is a gas lighter than air. If a vial ever shatters, it disperses upward and out in seconds — ventilate the room and it's gone. It doesn't settle, stain, or linger.

50 years proven

The same Swiss GTLS technology has been certified in dive watches, aircraft instruments, and emergency exit signs since the 1970s — worn and carried daily by millions.

Light source
Gaseous tritium light source (GTLS), Swiss-made
Vial
Laser-sealed borosilicate glass, phosphor-lined
Sizes
1.5×6 · 2×6 · 2×12 · 3×11 · 3×22.5 mm
Pendant body
Grade 5 titanium (Ti-6Al-4V) · CNC · ±0.01 mm · bead-blasted
Service life
25+ years usable glow · 12.3-year half-life
Power
None. Ever.
Environment
Unaffected by water, oil, vacuum, altitude, or being forgotten in a drawer
Guarantee
30-day no-questions returns · factory-direct price
Queries

Asked before checkout.

Is tritium safe to wear or carry?
Yes. The beta radiation tritium emits is too weak to penetrate the glass vial — or even the outer layer of your skin. The same technology has been used in dive watches, gun sights, and emergency exit signs for decades.
How bright is it, really?
Bright enough to find instantly in total darkness and to read by up close once your eyes adjust — not bright enough to light a room. Quiet ember, not flashlight.
Can I turn it off?
No — and that's the point. The decay runs continuously regardless of temperature, water, vacuum, or how many times it's dropped.
What happens after 25 years?
The glow fades gradually; it never abruptly dies. At year 25 you'll have roughly a quarter of the original brightness — still clearly visible in the dark.
Do you ship internationally?
We ship to the US, EU, UK, Canada and most of Asia. Some countries restrict tritium imports; if yours does, checkout will flag it before you pay.
Always on · Zero power

Outlast every
battery.

Vials from $8.90. The ECHO titanium pendant, $59.

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