Stick-on Temp Gauge

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From BrewDemon.com

When it comes to knowing the right time to pitch your yeast you could wait until the witching hour when the moon is full and the brew demons parade about the earth or you can simply rely on this handy thermometer. Attach this self-adhering temperature gauge to the side of your fermenter and you will know exactly when your brew has hit that magical temperature range. It even lists the temp in Celsius degrees for all you metric lovers out there. Included (1) Stick-on temp gauge