While the incidence meter can help, you can probably measure closer. Case in point: Can you measure within 1/16" if you are locating the wing onto the fuselage and make a 1/16" measurement error on a 10" wing chord that results in an error of 0.35 degrees. that is closer than you can see on the "needle" type incidence meters. The digital type - maybe you could do better.
Of course if you can measure closer than 1/16"...!
On a 3" wide stab (w/o elevator) a 1/16" error is 1.2 degrees. You would surely see THAT with a meter, but again the needle type would be hard to completely see the correction!
Of course, meter or not the best way to assure alignment is with a flat fuselage top and a flat building board!