The lite version of JazzDiskBenchPro does a quick benchmark speed test of the internal SSD.
So I purchased the pro version for a dollar because it supposedly does a speed test of my external SSD.
But it does not do this. JazzDiskBenchPro itself is horribly designed and just doesn't make sense. On the settings tab I can select an external. However, there is no way I can actually test this drive.
JazzDiskBenchPro is useless. You get what you pay for. Except in this case it's not even worth a dollar.
Just stick with the light version if you want to test the internal SSD speed.