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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So i got this for my dog who was board and distroying the house and or having anxiety attacks. This was a cheap option and he loved it as a beginner puzzle. The covers slide so easily and don't stick like wooden puzzles. The amount of treat pockets is also great. The dog doesn't care what team it is related to and neither do I. If you are looking to keep your too smart dog entertained, tis is for you.

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Reviewed in the United States on February 19, 2026

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Judy (IA)

Louisville, US

★★★★★ 5

My dog loves this toy

Color: Iowa Hawkeyes, Size: Standard

I've tried other engagement toys for my dogs but they didn't seem interesting to her. But my mini-Schnauzer loves this toy. She is excited when this toys comes out of the cabinet. It keeps her mind engaged. Easy to clean. Great value for the money.

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Reviewed in the United States on December 10, 2025

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DEB

Lake Worth, US

★★★★★ 3

May Pose Choking Risk

Color: Mississippi State Bulldogs, Size: Standard

As far as the puzzle aspect my dog was not interested but it did entertain him as a chew toy and the base held up pretty good. Take note though, the brown blocks come right off and may pose a choking risk.

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Reviewed in the United States on January 13, 2026

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Donna M.

Fort Morgan, US

★★★★★ 5

Good First Smart Toy

Color: Mississippi State Bulldogs, Size: Standard

Good value for sturdy tou. My dog loves it. He is always looking for it. The only prom is he is so smart he finds the treats fast. It is durable under his bites and scratches, Great first smart toy.

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Reviewed in the United States on November 15, 2025