Worm Farming Moisture Meter for Red Wiggler Composting Bins Quickly check the moisture in your worm bin so you can know if your worms are in danger! Easy-to-read gauge alerts you to dangerous conditions with just a glance so that you can instantly react to keep your worms safe. Eliminate the guesswork involved in maintaining your worm bin and experience the peace of mind knowing that you will always know if a problem arises. Nine inch probe reaches deep into the worm bedding to get the most accurate reading possible, with no batteries required. Perfect for use with the Worm Factory, the Vermihut, and any other worm composing kit.