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Test Tube pH Pens
Test Tube pH Pens
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Test Tube pH Pens

Marsoni M251S
Sale price$63.25
Pay 4 payments of $15.81 a month.Shop Pay
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.

Delivery Options:

  • 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.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 2392 reviews
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Product Reviews
O
Verified Purchase
OG I.T.
Fort Morgan, US
★★★★★ 4
Good little rack for sink brushes and sponges.
Color: Suction cup-Black
A lightweight little rack, works just fine. It occasionally slides up out of the suction cups that connect it, hence the 4 star rating.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 23, 2026
R
Verified Purchase
Roberta M. Martin
New York, US
★★★★★ 5
Looks good. Neat and out of the way.
Color: Suction cup-Black, Color: Suction cup-Black
The suction cups didn’t stick to my sink, but the plastic strip adhered well. My husband didn’t even notice it on our sink for half a day. That was the look I was going for!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 28, 2026
L
Verified Purchase
Lea McGuire
Alexandria, US
★★★★★ 3
Better than the plastic ones
Color: Suction Cup-white
Stays in place on sink wall. Unfortunately it’s not coated very well and is already showing rust
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 31, 2026
O
Verified Purchase
oneofthe.twins
Birmingham, US
★★★★★ 5
Handy storage!
Color: Suction Cup-grey
Handy storage! Suction cups holds it in place but allows repositioning for perfect placement. Allows moisture to drain into the sink naturally while keeping everything near at hand. Can’t speak to durability but seems well constructed and should last for a long time.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 21, 2026
M
Verified Purchase
Mabel
Draper, US
★★★★★ 5
Very practical and organized
Color: Hanging-silver
Very functional!! I love it
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 22, 2026

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