text.skipToContent text.skipToNavigation

Configure Product
Saved Configuration
View Configuration
Terms and Conditions
Saved Addresses
Please validate your credit card and billing information.
Payment submission timed out. The server might be busy.
There was an error processing your request.
Please validate your credit card and billing information.
Please enter a card number
Please select a card type
Please enter a value for this field
Please enter first name
Please enter last name
Please enter a zipcode
Please enter an expiry month
Please enter an expiry year
Please enter an issue number
Please enter a start month
Please enter a start year
The card number is not valid
The card type is not supported
The card verification code is not valid
Zipcode is not valid
The expiry month is not valid
The expiry year is not valid
The issue number is not valid
The start month is not valid
The start year is not valid
This field is required
Errors were found with the address you provided. Please verify your address.
Date should be in MM/DD/YYYY format
Please enter valid values
Please enter future date
Please enter the shipping date
Shipment date is updated
Required Fields Missing or incorrect.
Required Fields Missing or incorrect.
We're sorry, there was an issue with your credit card, please try another form of payment.
We're sorry, something went wrong on our side, please try again later or contact Customer Service.
We're sorry, something went wrong on our side, please contact Customer Service to avoid duplication.
We're sorry, something went wrong on our side, please contact Customer Service to avoid duplication.
Please confirm that you have entered the correct information for this credit card number.
We're sorry, there was an issue with your credit card, please contact your issuing bank.
This card is expired, please update the information or try another card.
We're sorry, there was an issue with your credit card, please try another form of payment.
We're sorry, there was an issue with your credit card, please try another form of payment.
We're sorry, there was an issue with your credit card, please try another form of payment.
We're sorry, we're having trouble contacting your bank. Please try again later.
We're sorry, there was an issue with your credit card, please try another form of payment.
We're sorry, there was an issue with your credit card, please try another form of payment.
We're sorry, there was an issue with your credit card, please try another form of payment.
Required Fields Missing or incorrect.
We're sorry, there was an issue with your credit card, please try another form of payment.
We're sorry, there was an issue with your credit card, please try another form of payment.
We're sorry, there was an issue with your credit card, please try another form of payment.
Please confirm that you have entered the correct information for this credit card number.
Required Fields Missing or incorrect
We're sorry, there was an issue with your credit card, please try another form of payment.
We're sorry, there was an issue with your credit card, please try another form of payment.
We're sorry, something went wrong on our side, please try again later or contact Customer Service.
We're sorry, we're having trouble contacting your bank. Please try again later.
Required Fields Missing or incorrect.
We're sorry, something went wrong on our side, please contact Customer Service to avoid duplication.

Portable Temperature/Humidity Data Loggers with USB Interface

$70.00

Item# OM-141

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-9 $70.00
10-24 $66.50
25-49 $65.10
50-99 $62.30
100-199 $60.90
200+ $59.50

In stock

Lead Time ( If not in Stock): 7 weeks

Portable Temperature/Humidity Data Loggers with USB Interface OM-141 OM-141
Portable Temperature/Humidity Data Loggers with USB Interface is rated 3.8 out of 5 by 8.
  • y_2019, m_10, d_19, h_20
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.13
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_8
  • loc_en_US, sid_OM-141, prod, sort_[SortEntry(order=HELPFULNESS, direction=DESCENDING), SortEntry(order=POSITIVE_FEEDBACK, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_omega
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getAggregateRating, 116ms
  • REVIEWS, PRODUCT
  • One Button Starts/Stops Data Logging Without a PC
  • Plug-and-Play USB 2.0 Interface No Need for Cables, Cradles or Docks
  • Large Storage Capacity: 16,000 Pairs of Temperature and Humidity Readings
  • 3½-Digit LCD Displays Real-Time Temperature and RH Readings, Device Working Status and “Memory Full” (OM-143 and OM-144 Only)
  • Built-In Infrared Thermometer for Checking Temperature of Vents and Surfaces (OM-144 Only)
  • Sampling Time and Hi/Lo Temperature and RH Alarm Setpoints are Selectable Using Included Software
  • Software Also Calculates Dew Point and Wet Bulb Temperatures, and Mixing Ratio as GPP (Grains per Pound) or GPK (Grams per Kilogram)
  • One-Click Exporting of Logged Data to Excel® or Word
  • Long Battery Life (Up to One Year)

Product info

Measurement Type
Temperature, Humidity
Number of Measurements
2
Input Type
Internal
Maximum Samples
~16K
Display
None
Power
Battery
Data Interface
USB
Max Sampling Rate
10 sec

Product Specs

  • Display Type LCD
  • Display Size 3-1/2 Digit LCD
  • Maximum Ambient Temperature 40°C (104°F)
  • Minimum Ambient Temperature 0°C (32°F)

Description

Please check out Newest Released Temperature and Humidity USB Data Logger OM-HL-SP Series for more advanced features.

The OM-140 Series are low-cost, compact, battery powered temperature/humidity data loggers capable of unattended logging (recording) of the ambient temperature and relative humidity (RH) of an environment for days, weeks or months. The OM-144 data logger can also measure and optionally log surface temperatures spot-checked by a technician using the unit’s integral infrared (IR) thermometer. In addition, these units can also calculate and display absolute humidity levels in units of grains per pound (GPP) or g/kg. Also called mixing ratio, GPP is a more useful moisture metric than RH to water damage restorers. Using RH alone, a restorer might unknowingly introduce moist air—with a low RH but a high GPP—during a job’s drying phase.

Data logging can be started or stopped by pushing a button on the unit, eliminating the need to bring a laptop to the job site. After a data log has been captured and stored, it can be uploaded as a .txt file to any PC running the Windows® XP/7 or 8 operating system after plugging the data logger into one of the computer’s USB ports. The data logger’s internal flash memory is large enough to store 16,300 pairs of temperature and RH readings or for the model OM-144 nearly 10,000 sets of RH, ambient temperature and surface temperature readings. Included with the product is a mini-disc with the drivers needed to interface the unit to the computer, as well as software that can display a data log file as a table or graph and/or export it to Microsoft Excel. Exporting to Excel is recommended for sophisticated trending and analysis of humidity and temperature data and easy detection of unexpected excursions.

Rated 4 out of 5 by from small size and great efficiency My experience with this instrument is short but up to date it works very well.
Date published: 2016-03-05
Rated 5 out of 5 by from So Far So Good Been using two of these units for the past couple weeks and they are performing well. Temperature accuracy is as advertised (they give the exact same reading to the tenth of a degree C and these temps match other accurate devices I have. The relative humidity values vary by 0.5%, but this is in the advertised range. Very easy devices to set-up and to remove data..
Date published: 2016-12-26
Rated 4 out of 5 by from Great value. Excellent product. After 2 weeks of testing I'm going to give the OM-141 4 stars. If I could give it a 4.9 I would do that. I've only had one problem so far and it is not a showstopper. I initially set the sampling rate to 30 seconds to collect and simulate a collection of many data-points, way more than we need), and in one week it had collected more data than the software seemed to download without a 'timeout' error being thrown. There needs to be a way to set the timeout value. When I put these in production we will set the sample rate to 12 hours, more than adequate for our needs, but I'd like to only download the data when I receive an alarm. if my freezers are doing well, I can foresee a timeout occurring if the time between downloads is sufficiently long to record a bunch of data-points. In device setup, the sensitivity of the slider to set High/Low points is way too sensitive and I end up setting bounds slightly different from what I want. Not a big deal, but frustrating. As I explore the software I am continually surprised by how many features are available. The best advice I can give to new users of the products is to "Read the **** manual". Another problem we experienced had nothing to do with the device, but rather it was cockpit trouble: when we placed two of the device, I forgot to hit the start-button. I don't know what the solution would be on the OM141 to protect us from operator (me) error. Add that to your "would be a nice feature to have" list.
Date published: 2018-02-20
Rated 4 out of 5 by from Logger Good device, intuitive SW. Good device, intuitive SW.
Date published: 2018-12-03
Rated 3 out of 5 by from OK for low budget I wish I had purchased the 143. The 141 is hard to tell if it's Power On or Not.
Date published: 2018-09-08
Rated 1 out of 5 by from Frequent software malfunctions Purchased 4 of the base models of the OM-141. They worked the first time, well within advertised accuracy. Additional setups and data extraction work 10% of the time. Package software often has timeout errors even with small <100 data point sets. Frequently wipes data off devices for no reason as well. Manual and setup DVD provided no explanations for these peculiar cases
Date published: 2017-08-31
Rated 4 out of 5 by from great features I bought this instrument a couple of weeks ago and its very helpful to monitor our ac performance data.
Date published: 2017-07-23
Rated 5 out of 5 by from Great out the box Tested over and hour and checked. So far so good. Fixing to put them to work on mold lawsuit home and will follow up after recording for three weeks
Date published: 2017-07-19
  • y_2019, m_10, d_19, h_20
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.13
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_8
  • loc_en_US, sid_OM-141, prod, sort_[SortEntry(order=HELPFULNESS, direction=DESCENDING), SortEntry(order=POSITIVE_FEEDBACK, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_omega
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getReviews, 19ms
  • REVIEWS, PRODUCT

What wireless receiver will work with the MWTC-D-J-915? For some reason I thought the receiver would come with it.

Asked by: Wells
Hello Wells, receiver is sold separately. You can take a look at the MWTC-REC1-915 or MWTC-REC5-915 for your consideration: https://www.omega.com/en-us/control-and-monitoring-devices/wireless-monitoring-devices/wireless-receivers/p/MWTC-REC1-915 https://www.omega.com/en-us/control-and-monitoring-devices/wireless-monitoring-devices/wireless-receivers/p/MWTC-REC5-915
Answered by: DA Engineer
Date published: 2019-10-11

Would this device be compatible with any type of probe . we are currently loooking for a device to measure compost temperature and humidity via some kind of probe. Thank you !

Asked by: Marc Andre Lauzon
Hello Marc As long as it is one of the following thermocouple types: J, K, T, E, R, S, B, C or N Also the probe will need either a standard round prong or mini blade type connector attached at the end so it can connect to the transmitter.
Answered by: JA Engineer
Date published: 2019-08-28

What are the physical dimensions of the unit (length)? I would need to add the length of the thermocouple plug to find the overall length of the assembly. I need to verify if it will fit in our enclosure.

Asked by: ScottG
Hello Scott The dimensions of the device are 82.5 L x 25.4 W x 15.2 H mm (3.25 x 1 x 0.6&quot;) A mini-thermocouple connector's dimensions when connected to the transmitter are 20.6 (0.81&quot;) by 7.9 (0.31&quot;) and the width being 16.8 (0.66)
Answered by: JA Engineer
Date published: 2019-08-28

Dear Sir, We are interesting to purchase the product but we need some clarifications for this products, If the equipment is 24/7 working (Recorded) or only particular time working (Auto power off without disturbing the equipment? please advice.

Asked by: Urjita Electronics
When you are setting up the logger you can select either to stop on Memory Full or Memory Rollover for Continuous Recording. Thank you.
Answered by: Application Engineer
Date published: 2019-07-22

I have the HH-309A temp mapping tool, it was working while I was running on windows 7 but not that I am running windows 10 the tool no longer shows a connection to the computer. Is there another program that I need to download?

Asked by: Scott White
Scott, The problem is the driver. Not the program. I have the HH-309A as well and the communication to the unit stopped working with Windows 10. Luckily Windows 10 identifies my USB to serial cable (labeled USB-300 by Omega) as: - CP2102 USB to UART serial connection. But the provided driver by Microsoft did not work... nor the original driver by Omega. I found the Silicon Labs CP210x driver to USB connection in this site: https://www.pololu.com/docs/0J7/all#2 I installed the X64 bit version of it and it now shows in the Windows Device Manager under Port (COM &amp; LPT) as: Silicon Labs CP210x USB to UART Bridge (COM1) I re-installed the SE309 Software from the original mini-CD disk that came with the HH-309A unit and everything is now working perfect. Home this helped. Adrian Crisci
Answered by: AEC007
Date published: 2019-07-19

I use Linux, not Windows. A few Qs: 1. What is the default setting for sampling rate? 2. Will the device appear as a storage device if plugged into a Linux kernel? 3. If yes to 2., will the .txt data file appear on the device? Thx

Asked by: Cam W
Thanks for your questions. Unfortunately, the OM-141 (or the OM-HL-SP) will not support Linux since both logger&rsquo;s software is designed for Windows. However, we can recommend the product OM-HL-SP, the max logging rate is 1 sec and the default is set to 60 secs. Please contact us anytime with further questions.
Answered by: Jane
Date published: 2019-05-15

I have OM-62 and I'm on Windows 10 I have tried with several software to make it works. Can somebody send me the right one for this device. Regards.

Asked by: Abel
Hello, the Software link is listed under the 'Product Specs' on the OM-62 Product Page. Please call our Tech Support to help troubleshoot and get you up and running. 1-888-826-6342 | 1-203-359-1660 (US &amp; Canada).
Answered by: Jane
Date published: 2019-04-29

Hi we just buy a bunch of these monitors but we don't have cd-room; can we download the software?

Asked by: Efcamb
Yes, please visit use the link below to download the software, thank you. https://assets.omega.com/software/MWTC-D-Series.zip
Answered by: Jane
Date published: 2019-04-12
  • y_2019, m_10, d_19, h_20CST
  • bvseo_bulk, prod_bvqa, vn_bulk_2.0.13
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_10
  • loc_en_US, sid_OM-141, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_omega
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getContent, 103ms
  • QUESTIONS, PRODUCT
  • CE Icon CE

en-US
en
Save Configuration