This is a very tight fitting case for the NanoVNA-H 2.8" version. I couldn't find any models on the internet for this particular version. this is fully stackable with a height of 4 units, a width of 3 units and a depth o 2 units. When fully inserted, the NanoVNA moves about 1mm, this tolerance is to make sure of the smooth insertion and removal of the device from the case.