Please check out Newest Released Temperature and Humidity USB Data Logger OM-HL-SP Series for more advanced features with better price.
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
† All amounts shown in USD Note: Comes complete with Windows software on CD, protective cap, USB extension cable, 3.6V lithium battery and user’s manual. Models OM-141 and
OM-143 also include a magnetic mounting base. Ordering Example: (1) OM-143 Temperature/humidity data logger with LCD display, $135.00
Rated 5 out of
DR B from
So Far So GoodBeen 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 3 out of
OK for low budgetI 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 4 out of
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 1 out of
Frequent software malfunctionsPurchased 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
great featuresI 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
Rick W D from
Great out the boxTested 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