How do you read this thing? There is no arrow or other marking that acts as a guide.

There are two disks that rotate independently. I believe one is for automatic temperature compensation & the other is the specific gravity. When you take a specific gravity measurement, it will be obvious. Suck in enough battery "water" to cover the discs. It really is a brilliantly designed hydrometer, so much better than the glass tube & float type where you have to calculate the SG based on the temperature compensation read on the thermometer.

You squeeze the electrolyte back into the cell after testing right? And do you have to rinse it out before taking the next reading?

Yes, replace the electrolyte. Once out and you move to the next cell squeeze the bulb and suck in the new electrolyte three times to mix out any remaining electrolyte.

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Unitec 74274 Battery Hydrometer Hydro Volts

Product ID: 291707347

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Description

Unitec 74274 Battery Hydrometer Hydro Volts

Specifications

Asin	B007CW8Y9S
Best Sellers Rank	#360,838 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #154 in Lab Hydrometers
Brand	Unitec
Customer Reviews	4.4 4.4 out of 5 stars (212) 4.4 out of 5 stars
Date First Available	July 3, 2013
Is Discontinued By Manufacturer	No
Item Model Number	74274
Item Weight	4.1 ounces
Manufacturer	Unitec
Manufacturer Part Number	74274
Product Dimensions	1.57 x 4.13 x 7.09 inches

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