For those that are hitting up the beach and soaking up the rays and don't want to end up looking like a lobster you may want to invest in one of these.
The UVSunSense is a color changing bracelet that tells you when to re-apply your sunscreen. All you have to do is apply SPF 15 sunscreen or higher to the bracelet once you've finished lathering up yourself.
Once activated, the bracelet will turn purple and when it's time to go back for more sunscreen it'll be a dark brown.
Not a bad idea.
The bracelet will also turn a pink-ish color to warn you that you've had enough UV rays for the day.
However, UV exposure varies from person to person so don't completely rely on the bracelet to tell you when to go back for more sunscreen.