The Apple Watch and Microsoft Band use optical sensors to measure heart rate. The Jawbone Up3, which instead tracks your resting heart rate, uses bioimpedance sensors and several electrodes to measure your skin’s resistance to a small amount of electrical current. The Apple Watch and Microsoft Band use optical sensors to measure heart rate. The Jawbone Up3. You can […]
The temperature in your bedroom is perfect. Your blackout curtains have been drawn shut. And you’ve just finished a cup of chamomile tea and novel that made you laugh out loud and forget about whatever was bothering you earlier in the day. You’re just about ready to drift off, and suddenly the air conditioner kicks […]
Heads up!
DOT40 will be closed Sept 10–30, 2025 while our team competes at the IPSC Handgun World Shoot (and takes a little break).
You can still place orders online.
Orders will be processed once we’re back in October.
Thanks for your support!
— DOT40 Team
