GladGirl® Eyelash Extension Hygrometer & Thermometer helps your retention rates speak for themselves! Make sure your room has the perfect humidity level for lashing, no matter where in the world you may be! Single strand eyelash extension adhesive needs proper moisture levels to help it cure (dry) quickly and effectively. If your humidity levels are too high or low, this can affect drying time and therefore affect your lash extension retention rates. The GladGirl® Hygrometer will let you know, with a smile :) when your room has reached that optimal level of humidity 40%-69% and a comfortable 64-77°F (18-25°C) temperature. Pair this hygrometer with GladGirl® Cool Mist Humidifier for that perfect humidity oasis every time. See below for how to use and pro tip.