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Ships within 48 hours · Estimated delivery Sep 23 - Sep 28
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Description
Set of 16 Markes Certified Reference Standard Tubes CRS TNX 002-20, 73852-738536NEW Set of 16 Markes Certified Reference Standard Tubes CRS TNX 002 20 738521 738536 For sale is a complete, numbered set of 16 Markes International Certified Reference Standard (CRS) tubes. These tubes are essential for the routine calibration of thermal desorption (TD) systems and for verifying the performance of TD GC MS analytical methods. Key Specifications: Standard Type: TNX (Typically Tenax TA) the most versatile sorbent for wide range VOC
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.6 ★★★★★
Based on 222 reviews
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Product Reviews
★★★★★ 5
Buy it!!!! It’s great!!!
Color: Blue, Size: 5.5 Inch, Color: Blue, Size: 5.5 Inch
My dog is obsessed with this ball!!! It is very sturdy and he has fun chewing it and playing with it. I bought the biggest size for my mini Goldendoodle. Buy it!! It’s a winner!!!
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Reviewed in the United States on April 15, 2026
★★★★★ 5
Great toy for both inside & outside play!
Color: Pink, Size: 3 Inch, Color: Pink, Size: 3 Inch
My Yorkies love this toy! This is my 3rd purchase of the same type of ball - the small 3" JW Pet HOL-lee ball. I bought one for my first Yorkie, she loved it, so when I got another Yorkie puppy, I bought a 2nd. They play with them so much that they sometimes get left outside. The green one was faded and started to blend it with the grass, so I bought a new one. It's great for a game of fetch, and isneasy to wash. Wish I could select a specific color, as I'd really like a purple one.
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Reviewed in the United States on July 20, 2025
★★★★★ 4
Great indoors and out.
Color: Blue, Size: 4.5 Inch
This is a great toy if your dog likes balls. While it's not my dog's favorite (he favors small squeaky animals) it is safe indoors, soft on floor, walls and furniture and something durable for fetching.
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Reviewed in the United States on February 16, 2026
★★★★★ 5
Terrific for fetch, would not hold up to unmonitored chewing
Color: Colors May Vary, Size: 5.5 Inch
Fabulous for playing fetch. Young crazy-dog enjoys it! Would not hold up to using as a chew toy - we remove it when not playing with the dog.
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Reviewed in the United States on January 13, 2026
★★★★★ 3
Gave my dog an allergic reaction
Color: Blue, Size: 4.5 Inch
I have one that has lasted 2 years of hard play, very durable. However, this newest one in the teal color gave my dog an allergic reaction. Her face and eyes swelled up within 1/2 of playing with it. So I threw it out. I have had no issues with the green one that I bought yesterday ago.
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Reviewed in the United States on January 4, 2026
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