A two-piece mason jar lid is described, with said mason jar lid capable of being secured to a mason jar in the typical manner using a threaded band or ring. The two-piece mason jar lid includes an annular lid component and a circular lid component that can be rotatably disposed within the annular lid component. Indicia and indicators disposed on the annular lid component and circular lid component work in cooperation, such that rotation of the circular lid component causes the indicator to be aligned with the desired indicia, to, for example, indicate a date upon which fermentation within the mason jar may be complete. The annular lid component or circular lid component can also include one or more venting channels to permit venting of fermentation gases, while preventing air from entering the mason jar.
1. A jar lid for sealing a mason jar, the jar lid comprising:
a substantially planar annular lid component defining a circular opening therein, the circular opening having an opening diameter; and
a substantially planar circular lid component having a central diameter,
wherein the substantially planar circular lid component is separate from the annular lid component, but configured to be rotatably disposed within the circular opening of the annular lid component,
wherein the combined annular lid component and circular lid component have a combined jar lid diameter and are retained to the mason jar using a threaded annular mason jar ring, and
wherein a length of the central diameter is at least one third of a length of the combined jar lid diameter.
2. A jar lid for sealing a mason jar, the jar lid comprising:
an annular lid component defining an opening having an opening diameter, the annular lid component comprising indicia disposed about the opening diameter;
a separate circular lid component having an upper surface and a lower surface, the circular lid component securely and rotatably disposed within the opening diameter of the annular lid component;
a grabbable operating knob disposed on the upper surface of the separate circular lid component, the grabbable operating knob rotatable with the circular lid component and pointable towards one of the indicia.