I like the nutradip trimeter but apparently there is an older revision and a newer revision. My friend couldn't
get a good reading on his meter to save his life, and after recalibrating several times it turns out that the old
revision units have problems with being close to ballasts and it throwing the readings off. Once we moved
the meter away from the ballast the readings were perfect and the unit was performing as it should. Apparently
some people were able to contact the company and they sent out a new circuit board for the meters which
don't have this issue.