ArmourLite Isobrite 100 Series Watch






ISO100 is the world’s first T100 tritium illuminated ultra-lightweight polycarbonate watch. Isobrite watches use ultra-bright trigalight® T100 tritium markers on the hands, dial and bezel.

Tritium markers consist of small glass capsules filled with tritium, an isotope of hydrogen. The inner walls of the capsules are coated with a phosphor compound. As the tritium decays, beta rays are produced that strike the phosphor particles on the inside of the glass, causing them to emit visible light. The color of the light emitted is determined by the type of phosphor that is used. Unlike photo luminescent markers, they require no external light source to recharge them.

The T100 tritium markers are manufactured by Switzerland’s mb-microtec comany.


They are currently the brightest, most advanced tritium illumination available—up to four times brighter than standard T25 tritium markers. mb-microtec is widely regarded as the leading manufacturer of tritium markers in the world.

Designed specifically to meet the needs of military and law enforcement personnel, Isobrite watches (except ISO401) feature a Swiss Ronda Caliber 715Li quartz three-hand movement with a 10-year lithium battery, an anti-reflective scratch-resistant sapphire crystal, unidirectional ratcheting graduated divers bezel with two tritium markers, 4mm push-down double O-ring sealed crown, and 200m (20 ATM / 660 feet) of water resistance.

The Ronda 715Li analog quartz movement is one of the most reliable Swiss movements on the market. The 715li features a CR2016 3V lithium battery that lasts 10 years. The Ronda 715Li movement also features 5 jewels to help reduce friction, increasing accuracy.

Established in the Basel region is 1946, Ronda is one of the world’s largest manufacturers of precision electronic watch movements. Ronda produces two versions of the 715Li: a Swiss Made version that is completely made in Switzerland and a Swiss Parts version that is made in Thailand with Swiss parts.

ArmourLite uses the Swiss Made version guaranteeing a genuine Swiss movement of the highest quality and bearing traditional watch making excellence. The Swiss Made 715Li features a gold-plated EOL versus nickel-plating on the Swiss Parts version.

The 10-year lithium battery employed on the 715Li results in considerable savings. ArmourLite estimates the cost of servicing over 10 years (replace battery, seal, water resistance) to be approximately $49 versus $147 for watches employing standard four-year batteries.

Most polycarbonate watches use mineral crystals (hardened glass crystals); ArmourLite made the Isobrite watches with an anti-reflective scratch-resistant sapphire crystal. Most commonly found on high-end watches, sapphire crystal is cut from a polished slice of solid sapphire that has been created by the fusion and crystallization of alumina. Sapphire has a hardness of 9 on the Mohs Scale. It is so hard that only a diamond or very fine point can scratch it.


The polycarbonate case is designed for rugged field conditions. It features a shock-absorbing movement holder and is rubber O-ring sealed. The case has a stainless-steel back plate with four screws. The Isobrite ISO100 has a diameter of 47mm and a thickness of 12mm. Although it is a large watch, the ultra-light polycarbonate case material makes the watch wear smaller than the dimensions might first suggest. The watch has a good feel to it.

We found ratcheting bezel to be easily set while wearing gloves, even when 5mm neoprene cold water dive gloves were worn. The bezel features minute markings with tritium markers at the zero/60 and 15-minute marks. The watch dial features a 24-hour military time ring in addition to the standard 12-hour markings.

Two 22mm bands are included with the watch. The watch comes with a black silicone band. It has a buckle clasp with logo. The silicone band fits a maximum wrist circumference of 9.75 inches. A black nylon NATO strap is also included.

The MSRP for the ArmourLite Isobrite 100 Series 1SO100 watch is $499. It is not inexpensive, but you get a lot for your money. It is an excellent watch for the tactical professional.



Eugene Nielsen provides investigative and tactical consulting services and is a former officer. He may be reached at

Published in Law and Order, Feb 2015

Rating : 5.9

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