Glow-in-the-Dark Thermometer and Compass Keychain for Everyday Adventures

​A compact Montbell accessory built for everyday reliability on the trail. The Montbell Luma Gage is a dual-purpose tool that combines an easy-to-read thermometer with a dependable compass. Designed to clip effortlessly onto your backpack, zipper, or keys, it tracks temperatures in both Celsius and Fahrenheit, while the backside features a handy chart to help you estimate perceived temperature based on wind chill. With glow-in-the-dark markings on the surface and the compass’s four cardinal points, this small but mighty tool remains highly visible and functional even during pre-dawn starts or twilight descents.

Why We Love It

Small, practical, and well-made—this is the kind of item you don't think about until you need it. At X-Boundaries, we love the Luma Gage because it weighs virtually nothing (just 11 grams) but provides critical environmental information at a glance. The glow-in-the-dark feature makes it incredibly easy to locate your pack inside a dark tent, and having a reliable, battery-free analog backup for temperature and direction is a must-have safety habit for any serious outdoor enthusiast.

Key Features

• Dual-Function Design: Seamlessly combines a precise thermometer and an orienting compass in one highly compact keychain.

•  

• ​Glow-in-the-Dark Visibility: Features luminescent markings on the face and cardinal points so you can easily read it in low-light conditions.

•  

• ​Dual Temperature Scales: Displays the current ambient temperature in both Celsius (°C) and Fahrenheit (°F).

•  

• ​Wind Chill Chart: The back of the gauge includes a convenient reference chart to help you calculate perceived temperature.

•  

• ​Ultralight & Packable: Weighing just 11 grams, it clips to your gear without adding any noticeable bulk or weight.

Technical Specifications

• Material (Fluid): Solvent naphtha (Temperature-sensing fluid)
• Weight: 11 g / 0.4 oz
• Dimensions: H 2.0 x W 1.1 x D 0.4 in / 52 x 28 x 11 mm
• Style Number: #1827650
• Country of Origin: Taiwan

Care & Maintenance

• ​To ensure accurate readings and extend the lifespan of your Luma Gage:
• ​Cleaning: Wipe clean with a soft, damp cloth. Avoid using harsh chemicals or solvents that could scratch or fog the clear plastic face.
• ​Storage: Store dry and keep out of prolonged, intense direct sunlight when not in use to prevent the fading of the glow-in-the-dark material.
• ​Impact Warning: While built with durable Montbell construction, it contains fluid; avoid dropping it onto hard rocks or crushing it under heavy gear to prevent leaks.

The X-Boundaries Guarantee

Every Montbell item sold through X-Boundaries is 100% authentic, sourced directly from Montbell. Shop with confidence knowing you're getting genuine quality backed by our commitment to service.