Caffeine Testing: Specialty vs Chains

I took my caffeine meter out and about in London to compare caffeine levels in espressos around the city. My Caffeine Analysis video: Links: Patreon: Limited Edition Merch: My Books: How to Make The Best Coffee At Home: The World Atlas of Coffee: The World Atlas of Coffee Audiobook: The Best of Jimseven: Find me here: Instagram: Twitter: Things I use and like: My video kit*: My current studio coffee kit*: My glasses: My hair product of choice: *Affiliate links