1.5x3.0x19.0mm (pictures are for reference only)
with one side painted white (reflective paint)
Thanks to Aleksei Selivanov from Russia who provided the pictures of how he applied the vial for. Thank you, Aleksei ..... :-)
Last 2 pictures are similar rectangular vials but shorter (T1.5x3x9G, for reference only). TP1.5x3x19G has reflective paint and is 19mm long.
Last 1 piece...updated Feb. 27, 2019