Test Tube pH Pens

Marsoni

M251S

$63.25

Get it in 3 business days with 1 day shipping. Friday, May 29

Test Tube pH PensFits standard test tubes 16 x 50 mm or larger. Highly stable and accurate readings with a large LCD display. Designed for simple one hand operation. Automatically calibrates to pH 4, 7 and 10 buffers and can be adjusted to recognize some other non standard buffers as well. Features hold function, and auto power off with low battery indicator. General Purpose Glass Probe: EPA compliant for labs and wine Penetration Probe: for food & soil Flat Tip

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Fast: 2-3 business days
Express: 1-2 business days

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Exchange/Return Notes

We offer a 30-day return/exchange service after receiving.
Final sale items are not eligible for returns or exchanges.
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This set of bags was a great value for my money. Soaps all sizes fit in there perfectly. This is a very versatile item. I use one of mine in my bedroom for dry garbage like gum, wrappers and tissues, then empty it weekly. It’s a great quality. It’s all natural very durable. And the main reason why I got these is because they also exfoliate.

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Reviewed in the United States on May 2, 2026

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Ms. K

Whiting, US

★★★★★ 4

Nice bags for a good price.

The bag works well and I like the way it closes. If it was a little bit bigger where the soap could move freely I would have given it 5 stars.

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Reviewed in the United States on May 21, 2026

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BexRN

Pawtucket, US

★★★★★ 5

Great bags!

Great quality and amazing for my shampoo and conditioner bars. Love no plastic! They dry great hanging in the shower. 3 months so far and no mold or mildew.

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Reviewed in the United States on May 24, 2026

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Tim Hemi

Grantham, US

★★★★★ 2

Rough, doesn’t lather much.

Rough and doesn’t lather up like others.

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Reviewed in the United States on April 26, 2026

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Pat Smith