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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This was a gift for my 80 Y/O father, the numbers are easy to read and the date (Numbered day only) will have to be adjusted if the month is 30 days instead of 31. The wristband fit perfectly, so there was no adjustment of links. He has had it for a month now and forgot to take it off when he entered the shower, still works, but wont let that happen again. If it lasts a year I will be happy, it wasn't expensive for a Timex and the silver color looked like silver.

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Reviewed in the United States on July 3, 2024

Verified Purchase

Jesse Byock, Jules William Press

West Palm Beach, US

★★★★★ 5

Watch face in the dark

Color: Silver-tone/White

The indigo really works!

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Reviewed in the United States on October 12, 2025

Verified Purchase

ESPADRILLE COMFORT

Bozeman, US

★★★★★ 3

Time work watch

Color: Silver-tone/White

Inexpensive work watch, they last forever, the only complaint I have is that the band broke and I couldn’t find a replacement band, so I had it repaired instead , the watch works great.

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Reviewed in the United States on April 22, 2024

Verified Purchase

AMANDA

Whiting, US

★★★★★ 5

pleasantly pleased

Color: Silver-tone/White

This was a very good every day wearing watch.

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Reviewed in the United States on October 13, 2025

Verified Purchase

James Troiano

Lake Worth, US

★★★★★ 5

Reasonable price and Dependable

Color: Silver-tone/White

The watch was attractive and worked well. It was a good buy. It was a little hard to remove from the packaging. I am on the whole happy wit the purchase.

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Reviewed in the United States on May 11, 2024