db meter

What's a good dB meter that will give me accurate results? I'll be using it to measure my bass dB I found this one on amazon...

As the title states, im looking for a USB powered termlab. Would like it to include everything. Prices on a new one with single sensor setup now days is 649.99, so im willing to pay for used one as long as the price is fair compared to that. May consider older a/c powered model as long as the...