Today, I attempted to use these two tweezers to determine the values of the resistors and capacitors on the small PCB in the picture.
The performance difference between the two in this use case is pretty amazing... the Mastech returned plausible looking readings on all of the passive components, while the Uni-T failed to get a reading at all on some capacitors, and got very implausible looking numbers on others.
Both work well when the components are out of circuit, but there is no comparison when it comes to testing in circuit... the Mastech is in a different league.