Have you ever been (Bike) Camping, and the only water you have is in a water bottle....and you're trying to figure out how to measure out 1-1/2 cups of water for your ramen...and your cooking pot has tick marks in milliliters.
That's what this card is for.
Business card sized, laminated, waterproof, UV protected (I did a test where I submerged it for 14 hours...see video).
The price is in the "buy me a coffee" range, with $1 shipping (stamps and envelopes keep getting more expensive)
