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Mengshen

Digital Psychrometer - Handheld Backlight Temperature Humidity Meter Gauge with Dew Point and Wet Bulb Temperature - Battery Included, M350

    • Based on 438 reviews
Condition: New
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Availability: 15 left in stock
Fulfilled by Amazon
Arrives Thursday, Apr 24
Order within 14 hours and 23 minutes
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Features

  • Professional Digital Psychrometer2 in 1 Humidity & Temperature Meter. Accurately measure environments temperature, relative humidity, dew point and wet bulb temperature.
  • Wide Measurement RangeHumidity: 0 to 100% RH; Temperature: -22F to 212F(-30C to 100 C)
  • Fast ResponseOnly 10s response time. It can display accurate temperature humidity value quickly. With backlight, you can get clearly readings even in the darkness.
  • Widely ApplicationThis handheld digital psychrometer can be widely used in home, apartment, industrial, laboratory, greenhouse, warehouse and aquaculture.
  • Power Supply9V battery included in the package.

Description

Thanks for coming, you deserve the best! This is Mengshen's Portable 2 in 1 Humidity and Temperature Meter M350.It can accurately measure any environments temperature, relative humidity (RH), dew point, wet bulb temperature. Range:Humidity: 0 to 100% RHTemperature: -30°c to 100°c(-22°F to 199°F)Dewpoint Temperature: -30°c to 100°c(-22°F to 199°F)Wet Bulb Temperature: 0°C - 80°C (32°F - 176°F) Accuracy:Humidity: ±2% RHTemperature: ±0.9°F/±0.5°C (at 77°F/25°C)Resolution: 0.01%RH, 0.01°F/0.01°C Package Includes:1 x Digital Humidity and Temperature Meter1 x 9V Battery1 x use manual

Color: White


Brand: Mengshen


Product Dimensions: 2.2"W x 1.3"H


Battery Description: Alkaline


Mounting Type: Tabletop


Is Discontinued By Manufacturer ‏ : ‎ No


Product Dimensions ‏ : ‎ 3 x 0.01 x 0.01 inches; 8.47 ounces


Item model number ‏ : ‎ CECOMINOD048683


Batteries ‏ : ‎ 1 9V batteries required.


Date First Available ‏ : ‎ March 14, 2016


Manufacturer ‏ : ‎ Mengshen


Best Sellers Rank: #209,646 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #78 in Moisture Meters


#78 in Moisture Meters:


Customer Reviews: 4.3 4.3 out of 5 stars 438 ratings


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Apr 24

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • HT-350 = Solid Product
Review Image by Michael T. Michael T.
I have owned this phsychrometer for 5 years. It has held up in all types of weather extremes. My tool was perfect, no complaints at all. It is a very accurate meter in all respects. I need my tools to be precise because I am only as reliable/good as my tools. Unfortunately today I must buy another meter. My old one was in my tool bag and my drill dropped on it by accident and now its just a black screen. Its my fault and the tool would have last years to come. So, my next meter I buy today will stay in my school bag that never gets in harms way. Problem solved. I wish my pschycrometer never broke, then I could see exactly how long this brand lasts before they die. Amazon said I purchased it back in June of 2019. Its crazy how time flies. I saw this exact meter at Young's Supply, it was a Senco brand, everything is identical, it just has a Senco sticker on it instead. Just a FYI. I give this product a ten out of ten rating. If your in HVAC, my advice is to BUY this meter, you won't regret it. ... show more
Reviewed in the United States on July 3, 2024 by Michael T. Michael T.
    • I love it, but...
Under the right circumstances, ventilation can get a house drier than air conditioning, besides being faster and far more energy-efficient. On a warm afternoon, ventilation can dry a house that’s too cool to run the air conditioner. Comparing indoor and outdoor dewpoints will tell you when ventilation will help. That’s why I bought a dewpoint meter in 2014. Nighttime ventilation in summer can be disastrous because as the house cools, the relative humidity will rise. Wood, paper, and some textiles will absorb moisture, and your air conditioner will have to work harder the next afternoon. By displaying RH, a dewpoint meter will tell you when to close the windows. After 3-1/2 years, my old dew-point meter wouldn’t turn on, so I bought a Mengshen. It’s much better. It feels like quality. Off, it draws only 9 microamps; so a battery should last years. On, it draws 2.2 milliamps. By default, it shuts off after 15 minutes. If I never remembered to turn it off, a battery would be good for about 1,000 operations. Trying to spot the old one on a cluttered desk was a nuisance. The new one is bigger and white with a red button. I can’t miss it. Better yet, it has a keyhole slot in back, big enough for an 15-gage nail or a #2 screw. I keep it on the wall by my digital thermometer. That improves accuracy because I can press the button to get a reading without handling it or breathing on it. Accurate If I give it time, the thermometer agrees well with other thermometers, inside and out. Wet salt in a closed container produces a relative humidity within 1% of 75%. I have a microwave bowl with a vent in the lid slightly larger than the meter shaft. With a little tape around the shaft, it fits snugly. I make sure the bowl is completely dry and cover the bottom with salt. I use a syringe to wet the salt, being careful not to splash the sides or have salty water visible besides the wet salt. Like my last meter, this one reaches equilibrium within 1% of 75%, meaning the temperature and dew point are very accurate under those circumstances. Wunderground has a page showing dew point readings at several locations within 10 miles of me. On days when their readings agree with each other, my Mengshen agrees. Sensitive If I hold the meter at arm’s length above my desk, the temperature, dew point, and relative humidity will go up and down. That’s because a little of the air I exhale mixes with the currents that hit the sensor. The old one read dewpoints in increments of about 0.6 F. This one shows changes in increments of .01 F. I prefer it. Annoyances Slow thermometer The massive chrome-plated brass shaft was the feature I hated most about the old one. Its thermal mass acted as a heat sink, slowing the response to temperature changes. The Mengshen has a similar shaft that’s even more massive. When I got it, I thought it was defective because it stayed 2 F low compared to my indoor thermometer. Half an hour later, it matched my indoor thermometer. It’s accurate but slow. I left it on the porch until it had cooled 10 F. I brought it in, and it took 45 minutes to warm within a degree of my indoor thermometer. (The emissivity of good electrical tape is much higher than that of polished chrome. A layer of electrical tape on the chrome will speed up the thermometer, but it’s still very slow.) If it’s hanging on the wall, it will give a good RH reading in 10 seconds, but if I take it to an environment at another temperature, I’d better come back in 45 minutes. I do that in unused rooms because a high RH will tell me I’d better give a room AC in summer or heat in winter. If I want to know RH in a hurry, I can use the meter for dewpoint and an infrared thermometer for temperature, then have an online calculator tell me the RH. It was probably designed with a heat sink so that currents of warmer and cooler air wouldn’t cause erratic readings hanging on a wall. C and F Both instruments let the user cycle through temperature, wet bulb, and dew point. Both mix C and F readings, meaning I must cycle through six readings instead of three. That’s a nuisance. However, if I just want to know RH and dewpoint, I don’t have to switch at all. Wet bulb A wet-bulb reading could be used to check the instrument against a wet-bulb thermometer. It’s calculated from temperature and dew point. It seems the processor was programmed wrong, because the three do not agree. Wet-bulb readings seem to be about 2 F low. The wet-bulb reading in the old one was also off. Switching When I switch to cycle to the reading I want, sometimes there’s a delay of up to a second, and sometimes I have to hit the button again. Switching off has the same problem. I don’t think the switches are defective. I think during some parts of the update cycle (once a second), the processor isn’t ready. Battery compartment. The battery compartment has no room to spare. It’s tricky to squeeze the connector wires out of the way so the lid will close. I’d say the Mengshen has design flaws, but I still love it. ... show more
Reviewed in the United States on December 14, 2017 by Stephen Throop
    • Item Specs.
Accuracy was best in class 5 stars, LCD has light , very nice ! Unit defaults in Celsius however not a deal breaker.....Nice Meter for thy Price.
Reviewed in the United States on March 1, 2024 by Mike Kemper
    • Works great.
Works well. Same reading as our Extech meters.
Reviewed in the United States on January 6, 2025 by BC
    • Great tool
This is a great tool for checking A/C digital thermostats. I noticed the a/c guy cleaning my system had one, adjusted the thermostat readings with this tool by the ambient temp in the house. For the price very accurate, highly recommend.
Reviewed in the United States on May 4, 2023 by D. Clark
    • Could be great, but you get what you pay for.
Worked great but only lasted a day before the thin plastic broke because of the heavy metal piece on top. As far as the sensors and display are spot on.
Reviewed in the United States on August 21, 2018 by Kevin H.
    • An amazing buy, and it always gives a super accurate humidity and temperature reading!
Amazingly accurate humidity gauge for about 1/3 the price. I owed this now for a little over 2 months, and I am very pleased with it. I did the salt test (depending on a lot of different factors, it is best to wait 24 to 36 hours to be 100% save. The last thing you want to do is remove your gauge too soon while the humidity is still "at a super-snails pace" increasing) and this gauge showed a 74.50% final reading. In order to get a faster and more accurate temperature reading, I wrapped the metal post with some "self adhering bandage wrap". That is because metal is super temperature sensitive, and takes much longer to readjust or change (say as compared to a plastic post) when being quickly moved into a new setting. I highly recommend this gauge, and I seriously doubt that you will find a better one (I did research for several weeks before choosing) for this low price. I'll finished by saying that I paid the full price, and received nothing in return for writing this review. ... show more
Reviewed in the United States on March 20, 2018 by Kevin5
    • Works great. Seems accurate but….
4.5 stars because pic shows storage pouch, but its not included. Only meter and battery in package. Not the end of the world, but would of been nice to have a way to keep meter from dust. Other than that…it’s all good.
Reviewed in the United States on May 7, 2023 by Ziggy

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