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This Hygrometer is on sale because it only shows the temperature levels at Celcius (Cº) degrees. Humidity readings are correct.
Making sure your glue works depends on the temperature and humidity levels of your working space.
Optimal lash working temperatures and humidity is
65ºF - 75ºF (18ºC - 24ºC)
45% - 55% Humidity
Anytime your reading is lower in the recommended setting, it means your glue may take longer to dry, and it may dry faster in higher readings.