If at some point you want an accurate step attenuator for RF use then maybe consider the R&S DPU. This is a 2GHz step attenuator rated to about 400mW. These attenuators are very old, very big, very clunky to operate and very heavy but the RF performance is very good indeed. I bought a couple of these for £15 each a few year ago. They are probably as old as me but they work extremely well. I had to strip/service both of them to get the performance reliable up to 2GHz but it didn't take very long. These are precision attenuators with very accurate 1dB and 10dB steps to 140dB. I think they were meant to be used for test equipment proving and they must have been very expensive when new. But if you can live with the size and heavy/clunky controls these are hard to beat for accuracy. They are often available very cheaply but they will need an internal service if they are old as the ones I have here. By internal service I mean strip and clean the metal bores the attenuator slugs move along as they get selected by the cam mechanism. This needs to be clean to maintain the performance up at 1GHz+. If the attenuators have been stored poorly this can lead to some oxidation in the bores. This can cause the slugs to become sticky and erratic when selected. But a good clean/service can sort this out.