How about a Raspberry Pi project kit? Raspberry Pi is a small computer that can be programmed and used for a variety of DIY electronic projects. You can find kits online that come with all the necessary parts and instructions for building a specific project, like a retro gaming console or a media center. Your husband would love the challenge of building his own electronics project and he could use it for entertainment, learning or experimentation. It could be a really meaningful gift that both recognizes his interests and challenges him creatively.
Or you can get him a star map with the date when he was born.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.