cooling hydrometer

[K-Dog]

My old one just corroded into nothing. I got it from Trac-Auto back in the late 80's. I recon I am due.

I do collision repair so the extent of my work with cooling systems is generally R&R or R&I radiator. Sometimes systems are pretty dry when I get them so significant refilling is not out of the question.
So point being I don't need a super fancy one, but one that is good enough I can send a customer up the road and feel comfortable.
Looking on Amazon I feel like I can't really find one with enough positive reviews. *shrugs* I recon I am being too picky. Either way I can't decide.

What do you guys use? What do you recommend ?

Thanks a bunch.

 

[royesses]

I've always used one like this refractometer type:
http://www.amazon.com/dp/B00AJGTESO/?tag=atomicindus08-20

 

[txvwnut]

You should only be using a refractometer for testing coolant.

 

[Fedwrench]

test strips.