Waterproof Dissolved Oxygen Meter Pen

Marsoni

M251S

$177.00

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

Waterproof Dissolved Oxygen Meter PenMeasures dissolved oxygen to determine water quality in environmental testing, labs, industrial and municipal wastewater, aquariums and fish hatcheries. Designed for simple one hand operation with automatic temperature compensation and calibration to air. The polarographic probe has a built in temperature sensor and easy to replace pop off probe heads. Simultaneously displays dissolved oxygen and temperature readings. Also holds readings and recalls

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I was buying these at the store and they are hard to find and more expensive.The reason these are special for me ,they are gentle ,they are more moist than others that are almost dry sometimes and they are not irritating to eyes The others irritate my eyes terribly .These do not .You can remove eye makeup easily with no irritation .They are the best and the. A get multiple packs instead of buying one at a time .I highly recvomend them .

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Reviewed in the United States on February 2, 2026

Verified Purchase

VIKO

Los Angeles, US

★★★★★ 5

Gentle on my skin

Been using this brand for years and they have always worked and not irritated my skin so I will continue using them. They do claim to remove waterproof mascara but it doesn’t, however they do remove all the make up.

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Reviewed in the United States on March 17, 2026