- Product Details
- Shipping and Returns
- The BPZ Promise
- Why Bulletproof Zone?
The Hazard 4 Heavy Water Diver in Blackout finish is a 50mm Grade 2 titanium dive watch powered by a Ronda 515 Swiss quartz movement and fitted with self-contained tritium gas-tube illumination on every marker and hand. At approximately 3.8 oz on the wrist, the titanium case is half the weight of a comparable steel case while offering double the tensile strength. Water resistance is rated to 300 m / 990 ft, and the sapphire crystal is anti-reflective coated on the interior. The Blackout variant pairs a PVD-black case finish with a custom bracelet band and ships in a military-grade thermoformed travel case.
Who this is for
- Dive and water sports enthusiasts: a 300 m depth rating, screw-down crown, and uni-directional 60-click bezel make this a fully functional dive tool.
- Professionals who need reliable low-light readability: tritium gas tubes glow continuously without charging — no UV exposure needed, no fade by morning.
- EDC-focused wearers who work across formal and field environments: the 3D stencil numerals, sapphire crystal, and PVD-black finish read as dress-capable without sacrificing toughness.
Tritium illumination
Unlike luminescent paint that requires UV charging and fades within hours, the Heavy Water Diver uses self-contained tritium (H3) Swiss mini-lamps — the same technology found in quality pistol night sights. Tritium glows through natural radioactive decay, requiring no charging and no external light source. The vials sit 80% above the dial surface rather than flush-inset, which makes them visible from oblique angles and around the edges of the case, not only when viewed straight-on. Tritium has a half-life of 12 years: after 12 years the tubes will be half as bright as they are today, still functional but progressively dimmer over time.
Case and crystal
The 50 mm case is machined from Grade 2 titanium with a bead-blast finish on the natural variant and PVD black on the Blackout. Titanium at this grade is hypoallergenic, corrosion-resistant, and substantially lighter than 316L stainless without sacrificing structural integrity. Case thickness is 15 mm. The crystal is scratch-resistant sapphire with an anti-reflective coating applied to the interior surface to reduce glare without adding an exterior coating that could wear away. The case-back and crown both screw down to maintain the 300 m water resistance rating. The crown is sized and knurled for easy operation with wet or gloved hands.
Dial and bezel
The dial layout combines 3D military stencil-cut numerals in a two-layer design with an angled minutes inner-dial and an integrated 24-hour military time scale — both uncommon on a single dial. The hour markers are machined into the bezel rather than printed, so they will not scratch off with use. The uni-directional bezel delivers 60 audible clicks per rotation and carries a tritium zero-marker at the 12-position porthole. Uni-directional rotation ensures that any accidental bump of the bezel can only cause elapsed time to read longer, never shorter — a critical safety feature for dive timing.
Movement and power
The Ronda 515 is a Swiss-made quartz movement with a date complication positioned at 4 o'clock. Battery type is 371 silver oxide, mercury-free. Standard battery life runs approximately 2 years from the day of installation; exposure to sustained heat or cold will affect that interval. The movement is battery-powered and does not require winding or rotor servicing.
Strap and included hardware
The Blackout ships mounted on a custom bracelet band. Strap horn width is 24 mm. The watch uses user-serviceable fast-change screw-in strap pins, removable with a Torx 6 screwdriver or bit (not included), which means strap swaps require no spring-bar tool and no watchmaker visit. Each watch includes one military-grade thermoformed travel case.
Specifications
- Case material: Titanium Grade 2, bead-blast finish
- Case finish (Blackout): PVD black
- Case diameter: 50 mm
- Case thickness: 15 mm
- Strap horn width: 24 mm
- Movement: Ronda 515 Swiss quartz (battery powered)
- Battery type: 371 silver oxide, 0% mercury
- Battery life: approximately 2 years from installation
- Water resistance: 300 m / 990 ft
- Crystal: scratch-resistant sapphire, anti-reflective interior coating
- Illumination: self-contained tritium (H3) gas-tube lamps; tritium half-life 12 years
- Tritium vial position: 80% above dial surface
- Date window: 4 o'clock position
- Bezel: 60-click uni-directional with tritium zero marker; machined markers
- Product weight: ~3.8 oz (10.9 oz with travel case)
- Included: custom bracelet band; military-grade thermoformed travel case
- Design: Simi Valley, California, in-house team
- Movement manufacture: Swiss
Frequently asked questions
What makes tritium illumination better than standard lume?
Yes — tritium gas tubes glow continuously through natural decay, with no charging required and no fading overnight. Standard luminescent paint (lume) must absorb light to glow and loses brightness within a few hours in darkness. The trade-off is longevity: tritium output diminishes gradually over its 12-year half-life, while fresh lume at peak charge can be brighter in the first minutes after exposure.
Is a 50mm case too large for everyday wear?
It depends on wrist size and preference. At 50 mm the Heavy Water Diver is a large watch by any standard, though reviewers note it wears smaller in person than it appears in photos. The Grade 2 titanium case keeps total wrist weight to approximately 3.8 oz, which reduces the perception of bulk compared to a steel watch of similar diameter.
How does the screw-down crown affect daily use?
The screw-down crown must be unscrewed before setting the time or date and screwed back down afterward to maintain the 300 m water resistance rating. The crown on the Heavy Water Diver is large and knurled for grip, which makes the unlock-and-relock process straightforward. The full booklet and how-to video linked on the product page walk through the procedure step by step.
Can I change the strap myself?
Yes. The Heavy Water Diver uses screw-in strap pins rather than spring bars. A Torx 6 screwdriver or bit — not included — is all that is required. This makes strap swaps a tool-simple job without a watchmaker. The 24 mm horn width is a standard aftermarket size with broad third-party strap availability.
How long will the battery last and what type does it use?
The Ronda 515 runs on a 371 silver oxide battery, which is mercury-free and widely available. Expected life is approximately 2 years from the date of installation. Heat and cold exposure can shorten that interval. Battery replacement is a standard watchmaker service at any jeweler or watch shop and does not require returning the watch to the manufacturer.
Is this watch suitable for formal or office wear?
Yes. The 3D stencil numerals, sapphire crystal, and PVD-black finish give the Blackout a dial presence that reads as a dress watch despite the tactical brief. Several reviewers describe it as business-appropriate. The thermoformed travel case makes it a practical gift or travel companion for professionals who move between field and formal environments.
Bulletproof Zone will ship orders as soon as possible. For example, if you purchase three items, they will be shipped to you based on lead time and availability. This way you get as much of your order as soon as possible, which means that your order may come in separate packages, especially if you order products from different manufacturers.
We will bear the shipping cost for products returned because of product defect, misrepresentation, or false description. Afterward, we will initiate a full reimbursement should you decline an offer to replace the item with the same item of equal value and assured quality.
Order Confirmation:
As soon as you place your order with Bulletproof Zone, you will receive an order confirmation e-mail. This means that your order has been logged in our system and your credit card has been pre-authorized for the purchase. Afterward, we contact our suppliers to confirm the availability of the product you are ordering for immediate shipment. If your item is on backorder or unavailable, we will cancel the pre-authorization and duly inform you via e-mail.
Order Shipment:
Orders are shipped within five business days from the date of your order unless specified otherwise on the product page. The product page will contain the most accurate estimate on shipping and lead times. Shipping and lead times provided on the product page are our best estimates based various factors including order volume, information from our manufacturer, raw material fluctuations, etc., and may vary due to these factors.
You will receive an email containing the tracking information of your order after the order has been shipped to your location. If you do not receive tracking information from us within seven business days of the lead time specified on the product page, feel free to follow up with us at orders@bulletproofzone.com.
Bulletproof Zone is not responsible for lost or stolen packages. A tracking number will be provided when the package is shipped. It is the buyer’s responsibility to provide a safe place to receive mail. Once an item has been marked as delivered by the carrier, the seller is not responsible should that item go missing.
Some of our products are carried by manufacturers in various countries. Due to the nature and cost of the products that Bulletproof Zone sells, you may be charged additional import duties upon delivery. Our support team can help in investigating abnormally high import duty charges but we are unable to cover the cost of any import duties.
Damages:
We take full responsibility for any obvious damage to your product caused by wrong packaging or delivering an already defective product. Please inspect the packaging of your item(s) when they arrive, if you notice any damage, you should document it when signing for delivery. If the item(s) contained in the package arrives damaged, please send photos to support@bulletproofzone.com, and we will process an insurance claim on your behalf.
Returns and Cancellation Policy:
We back all our products with a customer satisfaction guarantee, so we created a fair return and cancellation policy.
All sales are final. No Refunds, No Cancellations. In most cases, once the order is processed, it is final and not cancellable. We may allow exceptions due to an order error or wish to return your order after delivery for any reason other than a product defect or misrepresentation. Any cancellation request is subject to an administration and cancellation fee equal to 10% of your order with a minimum of $35, whether order shipment is successful or not.
All sales are final on all closeout items and for custom manufactured bulletproof clothing once the manufacturing process has begun or not returnable unless there is a product defect or misrepresentation. Applicable to brands such as MC Armor, Israel Catalog, BulletBlocker, Tacticon Armament, Wonder Hoodie, and others.
Before returning any product, you MUST obtain a return authorization from our customer service representative. We can only process AUTHORIZED returns for items.
To make a Return or Exchange:
- Obtain authorization for return or exchange by emailing us at support@bulletproofzone.com explaining the reason for the return or exchange.
- Please use or indicate your order number as attention
Return or exchanges request submission must be within 14 calendar days upon receipt of shipment unless noted otherwise on the product description page. Your return must be in original packaging and unused.
We encourage using USPS flat-rate shipping in returning products to receive a shipping expense refund. Buyers must ensure all returned parcels delivery receipt AND signature confirmation. We highly recommend insuring your parcel as we cannot issue a refund for an item that we do not receive back should it get lost/damaged during transit.
Refunds:
Should an item be returned because it was defective, misrepresented, not as described, etc., Bulletproof Zone will issue a full refund and will reimburse the customer for all shipping expenses associated with the return.
Please allow 5-10 business days from the time the item is received to process a refund. Refunds will only be issued to the original credit card that you use when placing your order.
We stand behind our products 100%!
By purchasing any of our items, the buyer certifies they have read and agree to our shipping, return, and privacy policies.
The Bulletproof Zone Promise
When you buy body armor, you're buying your safety. We don't take that lightly. Here's what every order from Bulletproof Zone includes.
1. Authorized dealer of every brand we carry
Every plate, vest, and carrier we ship comes from the manufacturer directly to our warehouse. We don't sell gray-market product, surplus, or returns. That means factory-fresh stock, the full manufacturer warranty, and real after-sale support — the kind only an authorized dealer can offer.
We maintain authorized-dealer relationships with America's leading body armor brands, including Spartan Armor Systems, AR500 Armor, RMA Defense, Shellback Tactical, Caliber Armor, DFNDR Armor, Protection Group Denmark, BulletSafe, BulletBlocker, and over 40 more.
2. Best price, guaranteed
If you find a lower price at another authorized dealer of the same product within six months of your purchase, we'll refund the difference.
Why the "authorized dealer" requirement? Because gray-market and surplus armor may not be genuine, may have a compromised supply chain, and almost never comes with a manufacturer warranty. We won't price-match against products that may not actually protect you.
3. Free fitment consultation
Body armor only protects you if it fits. Email us a photo and your measurements before you order, and one of our specialists will help you size your carrier and plates correctly — at no charge, no obligation.
4. Trusted by thousands of customers
Bulletproof Zone has been a trusted authorized dealer of America's leading body armor manufacturers for over five years. We have over 4,000 verified Trustpilot reviews from real customers across all 50 states.
Price Match Guarantee — Terms
- You must have purchased the item from our website before requesting the price match.
- Discounted items and "free with purchase" items are not eligible.
- The item must be in stock on the competitor's website at the time of your request.
- The price match is valid for six months from the date of your purchase.
- The competitor must be an authorized dealer of the product. Auction sites (eBay, Overstock), discounters, and gray-market resellers do not qualify.
- The competitor must operate an online store. Brick-and-mortar-only retailers do not qualify.
- Price match applies to the item price plus shipping. Sales tax is excluded.
To request a price match, email us a link to the product on our site and the same product on the competitor's site within six months of purchase. We'll process the refund.
Why Bulletproof Zone?
At Bulletproof Zone, we are passionate about protecting lives. Every piece from our catalog is designed and rigorously tested to provide the highest quality of protection you need from firearms, explosives or even close quarters combat.
We’ve partnered with various manufacturers that operate within the United States under a strict set of guidelines both on a national and corporate level so that when you shop with us, you will be able to select from the highest quality body armor, ballistic plates and tactical gear available on the market.
Whether you are a military service member looking to find your own gear, a professional that operates in the security field, or an avid firearms enthusiast that capitalizes the importance of safety when shooting, our tactical gear will provide you the level of protection you need.
Any questions or concerns? Please call us at (408)-909-4938 or email us at support@bulletproofzone.com and a member of our professional support team will be in touch with you as soon as possible.
