Possibly our coolest Digits of Pi creation yet (shhh, don't tell our other products!). This amazing math keychain displays the first 1,095 right of decimal digits of pi, lit only by a phosphorescent glow in the dark background. Yes, it glows in the dark! All of this in an area about 1/2 square inch. The glow provides a beautiful greenish light so you can read the pi digits. No other light is required or recommended.
Most people should be able to read the pi digits, either with no help from a magnifier or using a typical magnifier you might have at home.
See our FAQ
entry for more info. The quickest easiest way to charge the keychain is a bright LED flashlight shined directly at the face of the content area for a few seconds or more, depending on how bright the light is. Sunlight works well also, but may be slower depending on how bright it is. Viewing the digits of pi is best done in the dark.
Black digits with green glowing background.
All materials used are high-quality and durable.
-Digits of Pi Locket Portion - Stainless Steel / Tempered Glass.
-Locket Diameter: Outer: 30 mm, Inner: 22.5 mm.
-Keychain: Stainless Steel, Total Length: About 10.5 cm
-Number of "right of decimal" Pi digits is 1,095.
The item is lead-free and nickel-free. If you have any questions about nickel content, please contact us.