Apple Watch Ultra 3 Teardown Confirms 6 Mohs Case Hardness
If there’s a new Apple product, then the iFixit channel will sooner or later perform a teardown on it. They’ve just posted one for the new AirTag 2 and one for the Apple Watch Ultra 3. I’m going to focus on the Watch here, but a quick point of interest is that the AirTag 2’s speaker was easily disabled, countering one of Apple’s safety claims.
Some other product teardowns are fascinating, but Apple’s tend to be less interesting as there are fewer internal modules to dissect and decipher.
What iFixIt Found
iFixit first had a warning not to undo the screws on the rear as they, bizarrely, do not grant you access to the insides. You need to remove the lens to see what lies within, and iFixit recommends you not do this yourself as the repair is difficult (4/10 on their scale).
The 2.313 Wh battery was readily discoverable and its capacity represented a 6% increase over the Ultra 2 (2.178 Wh), confirming that the Watch Ultra 3’s better battery life (14 hours GPS time vs. 12 hours) comes from a combination of a bigger battery and energy savings.
I was moderately intrigued by the tests on the hardness of the case (mostly because I’m looking at lens hardness in a separate research strand).
Apple Watch Ultra 3 Case Hardness – Fun Facts
- Both Ultra 3 and Ultra 2 have an anodised case (more correctly Diamond-Like Carbon (DLC) with PVD (Physical Vapor Deposition)) rated at 6 on the Mohs scale, higher than the original Ultra at 5 Mohs.
- The Ultra 3 case is 3D printed using a technique with titanium powder that requires less material than previously.
- Unsurprisingly, scratches are more visible on the frame edges than on the flat surfaces.
Here we go, have a look. Thanks for reading
https://youtu.be/TR9rPYlFTDE
Last Updated on 3 October 2026 by tfk the5krunner
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- Garmin 90-degree charging adapter: Charges your Garmin with any USB-C cable. Essential when travelling. I use one.
- Body Glide: The blue anti-chafing stick swimmers and runners carry. I use it.
- Speedo earplugs: Fewer ear infections and no cold-water dizziness. I use them.
- Dryrobe Advance: My winter changing robe for open-water swims. I use one. A cheaper option is the AONYIYI changing robe.
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- Beet It Sport nitrate shots: Beetroot shots I take in the days before a race. I use them.
- Garmin charging puck: The quickest way to top up before a session. I use one.
- Injinji: Toe socks that stop rubbing, so you run more. I use them.
- Ultimate toe protectors: Stop black toenails on long runs. They work. I use them.
- Compressport R2 v2 calf sleeves: My calf sleeves of choice. I use them.
- Cellucor C4: My pre-workout before hard sessions.
- TPU tubes: Schwalbe Aerothan, Tubolito and Pirelli SmarTube. Light, tiny spares. I use all three.
- G8 insoles: Adjustable arches, perfect position. I use them.
- Cycplus Cube: A 97g electric pump that gets a road tyre rideable in two minutes. I carry one. 5% off with code THE5KRUNNER.
Health, recovery and sleep
- Kineon MOVE+: Red and infrared light for sore knees, Achilles and other joints after hard training. I use it.
- FreeStyle Libre 3 Plus: Shows how my blood sugar responds to diet. Occasional use.
- hDrop: Measures my sweat loss in summer and indoors. I use it.
- Fourth Frontier Zone: Checks my heart under load in hard sessions.
- Oura Ring 5: My partner’s recovery tracker of choice.
- Eight Sleep: A cooling mattress cover my partner and I use nightly.
Watches and sensors
- Polar H10: My daily driver for waking HRV.
- Polar Verity Sense: My backup arm-worn HR sensor.
- Nomad bedside charger: Charges my iPhone and Apple Watch overnight. I use it, and many of their bands.
- Train.Red: The best muscle oxygen sensor I’ve used. Occasional use.
- Tymewear: Accurate heart rate and reliable ventilatory zones. I use it to pace endurance rides over an hour.
- Garmin Forerunner 970: A pro-grade triathlon watch. I use this.
- Apple Watch Ultra 4: My daily smartwatch. No phone needed on rides.
On the bike
- Continental GP5000 for everyday riding, and Aero 111 on the front for special occasions. I use both.
- Helmets: Specialized S-Works Evade 3 for road riding, and Rudy Project Wing for TT-style races. I use both.
- Ravemen FR300: A front light that mounts under your Garmin or Wahoo. I use one.
- Ravemen FR1000: The light and the computer mount in one unit, so nothing else goes on the bars. Better than mine.
- Ravemen FR1500SE: 1,500 lumens hanging under your Garmin, for proper night rides.
- Ravemen FR1100SE: 1,100 lumens under your Garmin, and up to 46 hours on slow flash.
- Ravemen FR500: A brighter FR300 with the same mount.
- Wahoo TRACKR Radar: I use it on one bike and Varia on the other. They perform the same.
- Garmin Varia RTL515: Radar that warns you of cars from behind. I use this model.
- Wahoo ELEMNT Roam 3: The bike computer that’s easy to use. I use mine on most rides.
- Favero Assioma Pro RS2: Accurate power pedals that swap easily between bikes. I use this model.
Home and indoor training
- NPE Runn: Makes my basic treadmill smart, sending more accurate speed and distance to my watch and Zwift. I use it.
- Google Wifi: Keeps Zwift connected in my pain cave. I use it.
- Apple TV 4K: Zwift on the big screen. I use two.
- Google Nest Doorbell (wired, 2nd gen): My video doorbell, running in both Google Home and Apple Home via Starling. I use it.
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tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors. See the gear tfk uses. ID
