Get a digital level (I use a Sears version) and build a bracket (mine is made of scrap aluminum) that can be temporarily attached to the prop blade to hold the digital level. Be sure to position the bracket/level on each blade in the same relative location to facilitate the blade pitch comparison. There is much discussion regarding this matter in the VAF/RV-12 blog.
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David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 (circa 1965) - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B 2020) - N124DH flying since March 2014 - 940+ hours (as of September 2020)! 
V AF donation through June 2021.
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