Unitec 74274 Battery Hydrometer Hydro Volts

Lo q buscaba para una batt de ácido

I recently purchased two Hydro Volts hydrometers and one ATC 4-in 1 refractometer to measure battery acid specific gravity in order to adjust battery charging parameters. I suspected that all these instruments were quite a bit inaccurate because they all gave different results. It turns out most hydrometers and refractometers give results with errors that are way too large especially when charging large expensive batteries. One Hydro Volts hydrometer gives results that are .017 lower than expected. Another Hydro Volts hydrometer gives me results that are .003 higher than expected. The 4-in ATC refractometer gives me results that are .010 higher than expected. To identify the accuracy error, I compared the results with a very high precision weight scale. I measured the actual specific gravity of the acid using a high pre cision weight scale. You measure the weight of a known volume of distilled water and compare it with the weight of the same volume of acid. The weight of the acid divided by the weight of the same volume of distilled water gives you a very precise value of the actual specific gravity. All the hydrometers and refractometers can be used but should be corrected for their specific errors. I think it is especially important to do so when charging large expensive batteries. I encourage everyone to make the same tests and make sure they test the accuracy of their hydrometers and refractometers. Charging batteries incorrectly causes battery damage and premature failure. For large and expensive lead acid batteries, It is very important to charge them very accurately by measuring the specific gravity very accurately.

Nachdem ich ihn das erste Mal benutzte, wollte ich schon eine schlechtere Bewertung schreiben. Habe auch den ersten Versuch die Anzeige für die Skala nicht entdecken können. Dann schon. Man kann (soweit die Batterie es erlaubt) wunderbar den Säuregehalt messen und entsprechend "einstellen". Funktioniert top. Auch der Saugschlauch ist meines Erachtens lang genug.

Not delicate as other glass cubes testers. Compact. 1 full squeeze of the bulb and the chamber is full, I always fill it twice as I feel it is more accurate. Little pricey, but I think it'll be around for a while.

I think these are made in Germany, but not sure. Ten years ago, I bought one marked with the Hella brand name. It was blue. This one is identical but red and marked with Midnite. I guess the maker sells these to various retail companies for promotional purposes. Right now Midnite has the franchise. It is a very good and precise device. The black squeeze bulb lasted ten years with testing 60 battery cells every 60 days before it developed a small air leak and would no longer draw enough acid into the test chamber to make accurate readings - so that probably somewhat over 10,000 bulb-squeezes. I will buy another one in ten years.