I have used a variety of indicators. Lately, Thingamabobbers have worked well for me. The Airlock indicators look promising to me but I have not used them yet.
http://www.fishairlock.com/
I have used a variety of indicators. Lately, Thingamabobbers have worked well for me. The Airlock indicators look promising to me but I have not used them yet.
http://www.fishairlock.com/