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.

Unitec 74274 Battery Hydrometer Hydro Volts

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Description

🔋 Charge your confidence with precision – never miss a beat!

360 FLEXIBILITY - Rotatable twin measuring device lets you test batteries from any angle without hassle.
ALL WEATHER READY - Elastic suction ball works flawlessly across all temperatures for consistent performance.
LEAK FREE CONFIDENCE - Innovative hydrostatic barrier stops leaks and air bubbles, guaranteeing reliable results.
PRECISION AT A GLANCE - Large, easy-to-read scale ensures accurate battery acid density readings every time.
GERMAN ENGINEERING EXCELLENCE - Crafted in Germany, this precision tool combines durability with top-tier accuracy.

The Unitec 74274 Battery Hydrometer Hydro Volts is a precision German-made tool designed for lead-acid batteries. Featuring a large, easy-to-read scale, a 360° rotatable twin measuring device, and a hydrostatic barrier to prevent leakage and air bubbles, it delivers accurate acid density and state-of-charge measurements in all temperatures. Lightweight and reliable, it’s a must-have for professionals ensuring optimal battery performance.

Specifications

ASIN	B007CW8Y9S
Best Sellers Rank	#224,442 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #87 in Lab Hydrometers
Brand	Unitec
Customer Reviews	4.4 4.4 out of 5 stars (212)
Date First Available	July 3, 2013
Is Discontinued By Manufacturer	No
Item Weight	4.1 ounces
Item model number	74274
Manufacturer	Unitec
Manufacturer Part Number	74274
Product Dimensions	1.57 x 4.13 x 7.09 inches

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