How to Use a Refractometer

Refractometer Problem

We have a refractometer at our shop. I have calibrated it with water.  It doesn’t seem to be giving a reading on a coolant i am testing it with.  The scale reads from 0-20%.   I figure it should read something on this coolant but it doesn’t.  The coolant came from a cut-off unit that runs a white milky semi synthetic liquid.

Thanks

Refractometers deal with refracted light.  (Think of a beam bending.)  What you have is diffused light.  Think of a beam spreading out.

Refractometers work on clear liquids.  You are trying to look through a fog.

You cannot use a refractometer on all coolants.

Contact your coolant supplier and ask them.

Mix up a brand new batch of coolant to specifications and see what that reads. If it reads at all it gives you a half assed starting point.

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