Recently on here I read a thread about using those glass bulbs inside the tank to measure exact CO2
levels because the liquids stay separate and you use a known KH
solution as your control.
Can someone link for me (or guide me in the right direction) to one I can purchase? I'm looking for a nice glass version that will not detract from the look of the tank and that does not use Ebay/paypal for payment.
Thanks in advance!