I Tested Caffeine Levels at Popular Coffee Shops (Unexpected Truth)

I tested caffeine levels at Starbucks, McDonalds, Blue Bottle, Dunkin Donuts, and Blank Street Coffee. Are the numbers actually accurate from what they posted online? Do different coffee shops diff wildly in their caffeine dosages in a double espresso? What should I test next?

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Stardust Coffee (20% off Discount Code: SHERVIN) https://bit.ly/shervinstar
Astrocat Apple Watch App (caffeine tracker): https://bit.ly/shervintracks

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** Timecodes **
00:00 - Start
00:43 - McDonald
03:22 - Starbucks
05:30 - Coffee Addiction
05:54 - Astrocat App
06:57 - Dunkin’ Donuts
08:07 - Stardust Coffee
09:03 - Blank Street Coffee
11:15 - Blue Bottle Coffee

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