MQ137 Ammonia Sensor for Arduino

Marsoni

M251S

$990.00

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

MQ137 Ammonia Sensor for ArduinoOne size : 32mm X22mm X30mm L * W * H Second, the main chip : LM393, NH3 gas sensing probe Third, the working voltage : DC 5V Four, characteristics: 1, with the signal output LED indicates ; 2 , dual signal output ( analog output , and TTL level output ) ; 3, TTL output valid signal is low ; ( lights lit when the output is low, which can be accessed microcontroller IO port ) 4 , analog output increases with the concentration , the higher the

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I had high hopes for this, but sadly, it fell short. I have to wear a CPAP mask at night & the dry mouth is just one of the things I hate about it. I saw this, read the reviews & decided to give it a try. I used it per the directions, but it really did nothing to alleviate the dry mouth. I'm giving it 2 stars because it doesn't taste bad, but that's the only good thing I can say about this.

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Reviewed in the United States on February 9, 2026

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Kathleen

Pawtucket, US

★★★★★ 5

Very Helpful with dry mouth due to Autoimmune illnesses

Size: 1 Ounce (Pack of 1)

I have an illness that causes very dry mouth and nothing seems to work even a $65.00 prescription that was recommended. My hygienist suggested I try Salivea, so I got the spray. I can honestly say nothing has work quite like this. It's only been a few days but I also bought the toothpaste and mouthwash. I'm highly impressed so thank you Loretta for recommending

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Reviewed in the United States on April 3, 2026

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Lady Anon

Omaha, US

★★★★★ 5

Relieves dry mouth

Size: 1 Ounce (Pack of 1)

Great seller, item as described. My rx causes dry mouth and this is the only product I’ve used that relieves it.

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Reviewed in the United States on March 28, 2026

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