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: https://youtu.be/etnMr8oUSDo

Links:
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The World Atlas of Coffee: http://geni.us/atlasofcoffee
The World Atlas of Coffee Audiobook: https://bit.ly/worldatlasofcoffeeaudio
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My video kit*: https://kit.co/jimseven/video-making-gear
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My hair product of choice: https://geni.us/forthehair
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Видео Caffeine Testing: Specialty vs Chains канала James Hoffmann