What are the dimensions of the vial? Is there a cheaper alternative? 20 dollars seems like a lot for what we're getting.

If you don't need 20 of them, you can get a 6 pack for a lot cheaper: https://www.amazon.com/Aquarium-Pharmaceuticals-API-Replacement-Test/dp/B07G4NGMM8/ref=sr_1_1?keywords=5ml+test+tube&qid=1645582702&sr=8-1 More expensive per tube though.

Can these be used to store Isopropyl Alcohol for on to go first aid kit? How big is the tube and is it fragile or strong enough for extended use?

I have noticed that the caps, while quite appropriate for water parameter test kits, would not be suitable for long-term storage of any liquid. They leak a bit.

What test tube rack would be best for these?

I built my own. If you want a cheap hack, get a block of styrofoam and press the top of an open test tube into it at intervals to get the outer diameter perfect. Then cut out the styrofoam to the best depth. Test tubes fit snugly.

Do you sell just a box of replacement caps?

If you looked for caps already and no results, that means that tubs with caps are sell together. No separate. You might want to contact the API and asked them directly.

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API Replacement Plastic Test Tubes with CAPS for Any Aquarium Test Kit Including API Freshwater Master Test Kit 24-Count Box

Product ID: 7253542

💧Snap-tight caps prevent spills & contamination

🔄Universal compatibility with all API & other kits

🧪24 precision test tubes with secure caps

AED 141

Duties & taxes included

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Description

🧫 Keep your aquarium testing flawless—because your fish deserve the best!

LEAK PROOF SNAP CAPS - Secure your samples with tight-fitting caps that eliminate spills and keep results pristine.
DURABLE EASY TO CLEAN - High-quality plastic resists staining and cracking, ensuring long-lasting, clear readings.
TRUSTED BY 1 300 AQUARISTS - Join thousands of pros who rely on API’s precision tubes for flawless water testing.
RELIABLE 24 PACK REPLACEMENT - Never miss a test with a full set of durable tubes ready to swap out anytime.
UNIVERSAL FIT FOR ALL API KITS - Seamlessly compatible with freshwater, saltwater, reef, and pond test kits—one solution for every tank.

API Replacement Plastic Test Tubes with Caps come in a 24-count box designed for universal compatibility with all API aquarium test kits, including freshwater, saltwater, reef, and pond kits. Featuring snap-tight caps to prevent spills and contamination, these durable tubes ensure accurate, reliable water testing. Trusted by over 1,300 users with a 4.7-star rating, they are an essential, affordable solution to maintain optimal aquarium health.

Specifications

ASIN	B0002AQL5G
ASIN	B0002AQL5G
Best Sellers Rank	#46,122 in Pet Supplies ( See Top 100 in Pet Supplies ) #62 in Aquarium Test Kits
Brand Name	API
Color	No Color
Customer Reviews	4.7 4.7 out of 5 stars (1,325)
Date First Available	June 15, 2004
Date First Available	June 15, 2004
Department	Unisex-Adult
Department	Unisex-Adult
Item Dimensions LxWxH	7.13 x 1.25 x 3.5 inches
Item Package Dimensions L x W x H	7.17 x 3.7 x 1.34 inches
Item Weight	3.17 ounces
Item model number	32
Item model number	32
Manufacturer	Mars Fishcare
Manufacturer	Mars Fishcare
Material	Plastic
Model Name	PLASTIC REPLACEMENT TEST TUBES W/CAPS
Number of Items	1
Product Dimensions	7.13 x 1.25 x 3.5 inches; 3.17 ounces
Size	24 PACK
Style	Replacement Test Tubes
Target Audience Keyword	fish

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