The Monk Skin Tone Scale is a validated alternative to prior skin tone scales (e.g. Fitzpatrick Scale), which has been adopted for multiple use-cases from measuring skin tone in nationally-representative surveys focusing on inequality, health, and aging to artificial intelligence and machine-learning. In the latter case, the scale has been adopted by Google and Meta/Facebook to ensure more robust and equitable AI systems, especially in the realm of computer vision. More information is available at: https://skintone.google