I have borrowed both digital and needle display SPL's from my dealer over recent weeks - both Radio Shack (a.k.a Tandy in the UK as was). The newer digital display type was not as good as the older one. I don't know why but the MRC didn't give anywhere near as good results with it. Several boom-notes were just not picked out properly.
Maplin do one but it doesn't do sub 300Hz which is no good for MRC.
I saw that Nexnix do one for about �25 but don't know how good it is.
Any strong recommendations from anyone also appreciated
Rgds
Nick