Coustic RTA-33 anyone ever use one

I just bought an dBx RTA-M mic and a MXL USB to XLR preamp. I didnt spend more than $150, assuming you own a laptop too

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kind off what I thought. Want more off a tuning tool, but a nice db meter would help.
Its ok for an RTA but it was off by +1.5 db in the 20-80 hz area vs a calibrated AC where I would get a 37 on the ac i got a 31 or something like that on that rta...

 
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