Weinschel 40dB fixed high power coaxial attenuator

I was able to get a used 40dB power attenuator from a fellow ham. It is a 250W version in a very good condition. The attenuator should be usable up to 6GHz.

Here some pictures:   

I did some basic tests with my miniVNAtiny 

and with a Siglent SSA3021X with tracking generator 

and their big brother, a R&S FSP7 . Here the three different results: