a device (usually a metal alloy component) used to maintain very high vacuum or to ensure high purity of gas used in industrial and scientific applications
The getter is important in maintaining a high vacuum level inside the VFD after the exhausting process. Above the getter will be a black spot (Boron material) on the VFD glass substrate indicating the display is properly sealed. If the vacuum is lost, the black spot will turn white indicating the seal is lost. This will render the display and will eliminate operation.