Diameter 10.8mm (15mm with pip)
This is a vial that vial maker produced before.
It still glows but not as bright as a new one.
Picture was taken a while ago.
We have last piece that is same as shown on picture.
3 others are similar but slightly brighter. However, they were made with a round window (was supposed to be coated white reflective paint leaving that not-coated-internally window to emit the light. somehow factory did not coat the surface with white paint or were scratched off)
these 3 are slightly expensive because of brightness. (code Sphere11GW)