<html><div>Search for Battery Refractometers on eBay, I got a nice one for under $25 from China, exact same item I've seen here in the U.S. for >$70. I keep a small vial of distilled water in the pouch for calibration, just a drop each time is all it takes. They often include a scale for Antifreeze readings, as does mine. I don't use my hydrometer much anymore.<br><br><br>From the Solar, Wind and Hydro powered office of Jeff Oldham/Regenerative SOLutions</div></html>
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