I am looking for intonation exercises for bowed strings. I use techniques mentioned by Simon Fischer in his books and those have served me well I think. However I am now able to match pitches well but only while hearing them. If I'm playing along with an ensemble I can match their pitch fairly well. My problem is that when I am alone my intonation is rather inconsistent.
I practice playing with an electronic tuner for hours and hours but this doesn't seem to help at all. After hours of practicing this way my intonational problems have not improved much. Teachers just say "practice scales" Which is an instruction which frustrates me to no end since I can't tell when my scales are truly in tune. That isn't to say I am completely inept, I am just not satisfied with my intonation for my playing level and I would like to improve.
I understand that intonation on bowed string is a combination of mechanical skill and internal audiation. I would like some exercises that can help with both.