Robinair 75240 Coolant and Battery Refractometer

It's easy to use and it's accurate. Just be sure to check the waterline calibration before you use it and make sure your coolant or battery acid is at roughly the same temperature as the distilled water you used for the waterline calibration.

This is easy to use and comes in a great case. I don't know of any disadvantages of this refractometer. It is made in China and the quality seems to be good. I would recommend it to a friend.

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As someone said they are all about the same except this is in a sturdy box whereas the other one I have is in a plastic case. This is heavier in comparison and seems to be well made and of good quality throughout. I have already used it to winterize our inboard engines. It worked well.

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I just bought this to take care of my Solar batteries, 16 of them. I have 4 hydrometers and everyone of them shows a different reading plus I have to calculate the temperature compensation with them. The Robinair Battery Refractometer is easy to use and a lot easy to read that the hydrometers. The scale is easily visible with good sides numbers. It only needs one drop of electrolite for measurements. It comes with a very good case, small amount of water and screwdriver for calibrating the unit and other small tools to take samples.

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Portions of our heating system are not well insulated and may be exposed to sub-freezing temps. Hence, it needs to be filled with at least some propylene glycol. I had a heating contractor do this a few years ago and watched how easy it was. Since all I needed was the fluid, a small pump, and a tester to prove the concentration/freeze point, I bought this tester. It was the same one the contractor used. I check it a few times a year to ensure none has leaked out and the system is still protected.

I think this was around $35 when I bought it, and even though it's a few dollars more now, it seems like it's a tool worth that since I don't have to pay someone else to do my maintenance for me. I can't see that it would ever "break", so I can't imagine why I won't still be using it in 20 years.

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