Anti-freeze testing the 'freeze point'

GW

sorry if this one has been beat to death- are you all using the fancy refractometers (I think i lost mine), or something more basic? I have been totally flushing and adding new, yet we have a new customer that says the last guy 'added in more antifreeze' every once in a while. I would need to check the ph too in this case. (I have the basic Hanna for that)

Jamie Hall

Can't tell you about the ways to measure antifreeze concentration — or at least sensitive ways — but there is a reason to potentially add some, or even dump and refill: you're not looking at pure glycol as your antifreeze. Most if not all also contain corrosion inhibitors and pH buffers, and those can and do get used up over time.

pecmsg

Refractameter

https://www.amazon.com/Ethylene-Refractometer-Propylene-Glycol-60/dp/B006P0SZR4

GroundUp

Always use a refractometer to measure concentration, and strips for pH. "Freeze point" is irrelevant here- concentration is what we're after.

GW

Thanks all, ok I’ll buy another one, somehow I thought they were more costly. Then, sure enough, I’ll find my other one and have two