Use the Gravity Gauge sign to display the current day's gravity forecast. When kept up-to-date, your sign will tell people when they can bounce around in low gravity, or if they should stay home when gravity is unbearable. The original sign was designed by Miguel Marquez, who allowed me to post the 3D version here.

Miguel's version has LED lights, this one uses a two-piece sliding indicator. If the arrow is not snug enough to stay put on the sign, attach some flat fridge magnets to the back of the sign and stick it to a metal surface. The sign is thin enough to bend and hold the arrow, keeping it from falling.