dummy load

I picked this dummy load up at an estate sale and it does not have any identifying marks. I presume it is oil filled. I can hear the liquid when I shake it, so I put a note on there for others if I loan it out. What I do not know is how much power this can take at what frequency and for how...

Hello there, My question is not amateur radio specific but I couldn't find an exact sub forum for my question. I hope it fits in here anyway. (Suggestions?) English is not my primary language, sorry about any English "drifting" of my part. I'm very new to the RF world so (one of) my first task...