pH 4.0 Buffer/Calibration Solution 500 ml

$14.95 $11.99 Save: $2.96 (19%)

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Captive Purity

Calibration solution for pH monitors or controllers. pH 4.0. 500mL.



**Variations of this product can be found in many online stores. The version we carry is of the highest quality. Although this item is eligible for price matching under our Low Price Guarantee, please be certain the product you want to price match is the same make and model.


Manufacturer Info

Captive Purity manufactures water filtration and water testing supplies for marine and reef aquaria. The brand is best known for their high-quality line of reverse osmosis filter systems and accessories. Captive Purity also produces refractometers for testing salinity, portable pen-sized meters for testing pH as well as replacement filter media for their RO and RO/DI filter systems.

Accessories for pH 4.0 Buffer/Calibration Solution 500 ml


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12 Reviewers (100%) would recommend this

Overall Rating:

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“This works”
5.0

Hi, How much can I say about this product other then it works as advertized. It comes in a nice container so it stays fresh.

  • 1
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“very accurate”
5.0

I purchase both the 7.0 and the 4.0 ph calibration solution and they are very accurate.and what's good about both you can store them in a cool place and use them over.

  • 1
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“Ph buffers”
4.0

Web access was great, order process great, delivery was right on time.

  • 1
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“Easy to use”
5.0

I'd never buy those tiny little packets over this. Sometimes more is better, and this is really one of those times!

  • 1
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“Good deal”
5.0

A good reagent and the price is right. Perfect for calibration of any Ph probe.

  • 1
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“Sure beats the little packs”
5.0

This is a very large bottle that will last a long time. Much easier then the little packets

  • 1
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“Buffer/Calibration Solution”
5.0

A must for calibration.

  • 1
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Overall, others give this:

12 Reviewers (100%) would recommend this

Overall Rating:

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4  Star
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2  Star
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