Alkalinity unit of measurement

[chappy]

What unit of measurement do the folks here refer to when talking about Alkalinity? I see meq/L, DKH, English degree of hardness, and PPM. I have the calulations to convert, but when in a conversation here what units do you refer too.
While on the subject, what do you consider good, or bad reads, and how often do you test?

 

[bang guy]

I prefer Meq/L when referring to Alkalinity but PPM ad dKH are equally understood.
IMO 3.5Meq/L is a good target level for the average tank. Lower is fine for the larger tanks or automatic Alkalinity replenishment.