Drop checker solution

[tinkerman]

Would anyone know how one can make the 4degree kh solution for a drop checker? I've been reading up on these and have only found that it seems to be distilled water and baking soda. Not sure on this and is there a way I can make it without a kh test kit?

 

[phanmc]

http://www.barrreport.com/estimativ...rs-why-how.html?highlight=drop+checker+regent

Or if you want to take the easy way out:

http://liquidarthome.net/khstandard

 

[mudskippers]

This is the link that I followed. But it requires you to have a digi scale...

http://www.plantedtank.net/forums/general-planted-tank-discussion/42429-kh-standard-how.html