How would the gauge assembly hold up to contact with liquids (left in loop permanently)?

Lol this gauge is to test the loop before you add any liquid if your loop hold air for 30 minutes then you good to go

Is it normal to see a small amount of pressure drop if I leave for a few hours or overnight?

You shouldn’t have no pressure loss. You shouldn’t leak test for a few hours or overnight. 30 minute leak test with zero pressure loss your 100% to go to fill with liquid.

How are the 0.05 bar increments measured on the guage? Is it every 2 lines or 1 line?

every line is around 0.05 bar, I say around since you have nine lines between 0 to 0.25 and 10 lines between 0.25 to 0.5

Will this work when putting all tubes together then doing the leak test on the fill port? I read someone was doing it individually how??

The way you are thinking is by building your whole loop, while that will work, if you do end up having a leak it'll be a pain to find it. Testing individually would by pumping up each block/pump/reservoir/radiator individually as to isolate and possible leaks immediately. If you use the one by one method I'd conduct another test once its all built.

EKWB EK-Leak Tester

Product ID: 167053788

Details

Brand
EK
Power Source
Battery
Color
silver
Manufacturer
EKWB
Global Trade Identification Number

💧Leak Detection

🔧CNC Machined Aluminum

⚙️Custom Pressure Gauge

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€ 147.14

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Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
EK
Power Source
Battery
Color
silver

Description

🔍 Test with Confidence: Never Let a Leak Ruin Your Setup!

PRECISION ENGINEERING - Crafted from solid CNC machined aluminum for durability.
UNIVERSAL COMPATIBILITY - Fitted with a revolvable male G1/4" for easy integration.
LEAK DETECTION MADE EASY - Quickly identify potential leaks in your liquid cooling system.
CUSTOM GAUGE FOR CONFIDENCE - Features a specialized gauge that clearly indicates safe pressure levels.
COMPLETE KIT FOR CONVENIENCE - Includes a small pump to effortlessly pressurize your cooling loop.

The EKWB EK-Leak Tester is an essential tool for any liquid cooling enthusiast, designed to quickly and safely test for leaks in your cooling loop. Made from high-quality CNC machined aluminum, it features a custom gauge for precise pressure readings and comes with a pump for easy pressurization. Its universal G1/4" fitting ensures compatibility with a wide range of systems.

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