This bubble popper and headspace measurer is used while canning to remove air bubbles before sealing jars and to confirm the appropriate allowance of headspace.
To make sure air bubbles have not been trapped inside the jar, run the bubble popper around the edges of the jar, gently shifting the food so that any trapped air is released. After the air bubbles have been removed, more liquid may need to be added to the jar to ensure proper headspace.
Convenient measure marks on one end of our bubble popper for measuring the headspace in your jars to avoid overfilling. Allowing the proper headspace according to processing directions for specific foods is necessary so that all the extra air will be removed during processing and a tight vacuum seal will be formed.
Heat-resistant plastic won't scratch jars. A must-have for home canning!!