With a range ending at 20 KHz (or 100 times higher), most of us could easily go the DIY route, implementing most of it in software. At that price point, there

With a range ending at 20 KHz (or 100 times higher), most of us could easily go the DIY route, implementing most of it in software. At that price point, there are A LOT of options, I'd recommend one of those 10MHz handheld oscilloscopes.