This is an American made refractometer for checking coolant concentration in water soluble coolants ( usually 3.5 to 4.5 % is what I've always gone by). I know from experience that you won't be happy with one of the cheap Chinese ones. You get what you pay for.
It's used but in excellent shape and works perfectly. It gives a good clear and bright view of the scale.
If you use water soluble coolants one of these is a must for maintaining the proper mix.
Good luck and thanks for your interest.
