For home canning use</br>Pops bubbles before sealing</br>Measures head space to prevent overfilling</br>Easy maintenance</br>Essential for home canning</br></br>Product Description</br></br>Norpro 591 Canning Bubble Popper And Measuring Tool is inserted in jars to easily remove air bubbles before sealing. Measurement marks measure head space to avoid overfilling. Heat resistant plastic won't scratch jars.</br><br/>http://www.amazon.com/gp/product/B003R9ES7M