I use a semi synthetic coolant on one machine and a fully synthetic coolant on another machine (may well standardise on the fully synthetic in the future)
I need to check oil concentrate in the coolant so thinking to buy a refractometer
Are the ones on eBay at around £10 as used for alcohol or salt content for aquariums suitable for checking coolant ?
Just don’t want to buy something that is not suitable

Cheers. Paul


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