138 MHz - 4.4 GHz, .5 dBm output steps, up to 10 dBm output power. A microwave signal generator on a USB stick for $500:
More equipment along these lines can be found here:
This is a very interesting development in low-cost microwave test equipment. The price point for this gear is so low that accessibility to test gear will be greatly increased and time saved from hunting for test gear at hamfests, which usually takes years to find the right piece.