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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Your Test Tube pH Pens orders ship within 1-2 business days.

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Standard: 3-7 business days
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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Was disappointed with this product , as the reason for me ordering this product was so that I could gift to my little 6pound yorkie in an Easter basket , considering that my pet preference is SMALL balls and these were pretty much an average size ball. So she didn’t get much enjoyment out of them. Price was very fair , but money wasted overall because she doesn’t play with them.

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Reviewed in the United States on April 30, 2026

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Desertmouse

Louisville, US

★★★★★ 5

Dog likes them

Color: Squeaky-Multi Colors, Size: 2.0"(Small)-12 Pack

Dog approved

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Reviewed in the United States on May 11, 2026

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Dave

Belleville, US

★★★★★ 5

One Tough Ball!

Color: Blue

Our dogs are loving this ball. Our 1 yr old hound is a world-class chewer and he can't make a dent in this ball. The interactive buzzing and bouncing keeps them entertained for long durations. It's a mite noisy but the barking from the 1 yr old is much louder, lol. Even turned off, they like playing with it and chewing on it. Based on the tough construction, we think it will last much longer than traditional chew balls.

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Reviewed in the United States on March 22, 2026

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Janice A

Bozeman, US

★★★★★ 5

My puppy’s favorite

Color: Orange

Great quality and built to last. My dog really enjoys playing with it and stays entertained for quite a while. The material is strong yet safe, and the included drawstring bag is a convenient extra for easy storage. Is colorful and my become my puppy’s favorite.

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Reviewed in the United States on March 1, 2026

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Amazon Customer

San Leandro, US

★★★★★ 1

If you love your dog…don’t buy this.

Color: Orange

We have a nonaggressive English cocker. She opened the ball every time she played with it. And yes, we are closing it as hard as we can. I do not recommend this toy for any dog! This is a dangerous toy for a dog that is not supervised.

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Reviewed in the United States on March 16, 2026