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Portable USB Temperature and Humidity Data Loggers with Display

Portable Temperature/Humidity Data Loggers with Display


Article# OM-71

Remises de volume disponibles
Calendrier de remise sur volume
Quantité Prix unitaire
1-4 C$336.84
5-9 C$320.00
10-24 C$313.26
25-49 C$299.79
50-99 C$293.05
100+ C$286.31

En stock

Délai de livraison (si pas en stock): 9 semaines
Portable Temperature/Humidity Data Loggers with Display OM-71 OM-71
  • Compact, Light Weight, Easy-to-Use
  • User Selectable Stop on Memory Full or Memory Rollover for Continuous Recording
  • PC Delayed Start or Pushbutton Recording Control
  • Read Recorded Data on Logger Display

OM-71 Options de modèles

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Modifiez ces spécifications pour commander un modèle différente. Toutes les combinaisons ne sont pas valides. Les options compatibles avec les sélections précédentes seront en gras.

*Les options en surbrillance ne sont pas compatibles. Veuillez sélectionner une combinaison différente.

Measurement Type
Number of Measurements
Input Type
Maximum Samples
Additional Feature
Data Interface
Max Sampling Rate

The OM-70 Series of portable temperature and temperature/humidity data loggers are easy-to use, versatile devices which can be used for a wide range of logging applications including coolers, freezers, greenhouses, museums, laboratories, shipping containers, warehouses, environmental monitoring and food storage.

These data loggers are capable of sampling as fast as once per second or as slow as every 18 hours. Models OM-71 and OM-72 can store a total of 43,344 temperature measurements in memory. Model OM-73 can store a total of 43,344 measurement points for temperature only or 21,672 points of temperature, humidity and dew point. The model OM-74 thermocouple data logger can store 32,638 temperature samples. Easy-to-use Windows software is included with each data logger.

The software is a full-featured program that allows you to set up all data logger functions including sampling rate, logging duration, start mode, logging mode, and high and low temperature alarm values. Once data has been logged, the program then allows you to download data from the logger, plot the data and export the data to an ASCII text or Excel file format for further analysis.

Software Features Include:
• Data summary to read statistics and alarm information in a simplified report format.
• Data listing for tabular view of detailed dates, times and values of recorded data.
• Graph function displays data in clear graphical format.
• Zoom magnifies data with powerful zoom and autoscale functions.
• Autoscale function fits data to the screen or allows user to manually enter their own values.
• Graphical Cursor displays exact data of any point in the graphical display.
• Export data in text or Excel format.
• Print graph or text data with print preview and setup options.
• Logger configuration allows easy set up and launch of data loggers with immediate or delayed start, preferred sample rate, alarm setup, and custom ID.
• Password protected calibration function automatically stores with parameters in device or restores factory defaults. A calibration Window is provided in the software to simplify the calibration procedure.
• Status windows display unique ID of logger, battery voltage, memory used, sample rate, duration, alarm condition and logging status.
• Menu Bar along the top of the screen provides one click access to software functions.

OM-71, OM-72, OM-73
Ambient Temperature Measurement Range
(Models OM-71, OM-73):
-20 to 70°C (-4 to 160°F)
External Sensor Temperature Measurement Range
(Model OM-72):
-40 to 70°C (-40 to 160°F)
Storage Temperature: -40 to 77°C (-40 to 170°F)
Temperature Accuracy: ±0.5°C (±1°F), from -17 to 50°C (1 to 122°F)
Temperature Resolution: 0.1°C (0.05°F)
Relative Humidity Range
(Model OM-73):
0 to 99% RH non-condensing
Relative Humidity Accuracy
(Model OM-73):
±2% RH from 10 to 90% RH @ 25°C (77°F)
Relative Humidity Resolution
(Model OM-73):
0.05% RH

Display Temperature Resolution:
0.1°C (0.2°F) up to 199.9 °C or °F,
1°C (1°F) above 200 °C or °F
Logged Temperature Resolution: 0.1°C (0.2°F)
Thermocouple Impedance: 50 ? max for specified accuracy
Cold Junction Temperature Accuracy: ± 0.3°C (±0.5°F)
Operating Temperature: -18 to 55°C (0 to 131°F)
Storage Temperature:-30 to 80°C (-20 to 175°F)

Sample Rate:
1 second to 18 hours user selectable
Alarm Settings: Over/under alarm with visual indication
LCD Display: Displays temperature, date, time,
alarm condition recording status and battery condition
Time Accuracy: ±100 ppm @ 24°C (75°F)
Measurement Capacity: OM-71, OM-72, OM-73:
Non-volatile memory; 43,344 samples
for temperature only, or 21,672 samples for temperature,
humidity and dew point (Model OM-73); OM-74; 32,638 temperature samples
Recording Control: Start on button press, immediate after setup,
or at a user specified date and time
Recording Mode: Stop on memory full,
or continuous recording with memory rollover
Minimum System Requirements: 8MB of RAM, 2MB of disk space,
800 x 600 resolution, 1 free USB port
Software Compatibility: Windows XP/Vista/7 and 8 (32-bit and 64-bit)
Interface: USB 2.0
Power: OM-71, OM-72, OM-73: 3 V CR2032 lithium battery (included);
OM-74; 3 AAA batteries (alkaline or lithium)
Battery Life: 3 years (average)
OM-71, OM-72, OM-73: 6 H x 5.7 W x 1.3 cm D (2.36 x 2.24 x 0.51')
OM-74: 5.7 H x 5.5 W x 3.0 cm D (2.25 x 2.15 x 1.2')
OM-71, OM-72, OM-73:
91 g (3.2 oz)
OM-74: 62 g (2.2 oz)
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Rated 4 out of 5 by from Solid Logger (for the most part) I have bought roughly 10 of these over the past 8 years. We use them for monitoring the temperature and humidity of a control room for Concrete testing. For the most part these are solid units. I have had a couple that had the screens go out on them after 5 years or so and the plastic gets discolored when exposed to sunlight. One had the temperature go out and it only lets you calibrate it slightly from the original settings. That said these generally work great with those few exceptions. The program for the PC is easy to use and understand. I will continue to purchase these as needed.
Date published: 2016-03-11
Rated 4 out of 5 by from works great. easy to use. had to guess where to get software to download data to but figured it out eventually. USB connection works easily, but I would now pay a little mre for a wireless download option
Date published: 2018-03-14
Rated 4 out of 5 by from Good for general monitoring We really like the OM-70 series for monitoring temperature and humidity during our testing. They work well and the software is easy to use. The only issue we have is that they will not stay in calibration in the lower 10 degrees C of the published range and there is no adjustment to correct this. We calibrate them to 10 C above the published low range and they work well there.
Date published: 2017-11-16
Rated 5 out of 5 by from Ok OK it is an small product but is very powerfull. I like it!
Date published: 2020-11-16
Rated 5 out of 5 by from Works as promised These are great for measuring temperatures in a concrete cure room that we have for ASTM C511.
Date published: 2020-08-04
Rated 4 out of 5 by from Good value for a stand alone data logger I have bought these many times over the years and appreciate the updates to the user interface. The data loggers are very robust and accurate. I would give this a 5 star review if there was a version of the software that would also calculate Heat Index as part of the standard data output. Very useful for safety studies.
Date published: 2019-07-11
Rated 1 out of 5 by from NOT A PRODUCT YOU WANT TO PURCHASE!!!! OMEGA will not support this product. You have to send over $65.00 for the software to operate the product. DO NOT PURCHASE THIS PRODUCT!!!
Date published: 2018-06-07
Rated 4 out of 5 by from Reliable instrument Have one of this working for more than 4 years in a curing room in the middle of the Mojave desert. No problem at all.
Date published: 2017-09-01
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Hello. I have the OM-73, the data logger starts recording when I finish the setup, but sometimes I find the data logger is off and the data logging stops. Can you help me with this problem?

Asked by: Gust R
Hello Please send request to
Answered by: JA Engineer
Date published: 2022-11-08

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

Can i use the unit without the pc and when i need to retrive the data i connect it to the pc ?

Asked by: RackMaster
Thank you for your question. The logger needs to be initially configured on the pc using the software. Once it is configured it is totally stand-alone to archive data and than later connected to pc to download the data.
Answered by: Application Engineer PV
Date published: 2021-04-30

When Calibrating the logger (per the user manual), is the new calibration stored within the logger itself or in the software app on the PC?

Asked by: ISS Lab
Thank you for your question. Calibration is stored in the logger.
Answered by: Application Engineer PV
Date published: 2023-05-19

I am looking at the OM-74 for use with a C-type or B-type thermocouple. How many hours do the batteries lasts, are they rechargable?

Asked by: L Rolly
The battery life could be up to 3 years depending on logging interval and the frequency you connect to PC for setup. It is not rechargeable, AAA alkaline or lithium are used.
Answered by: PVDAS
Date published: 2020-02-14

I have an Omega OM-70 series data logger at work. The data transfer cable cannot be found. Can i order another cable?

Asked by: Jake35031
Hello, this logger uses a standard mini USB cable that you can find in any electronics store. You can also order from us the replacement part OM-62-USB-CABLE.
Answered by: DA Engineer
Date published: 2020-02-25

The plastic loop on the OM-73 tends to break after repeated use. I would like to attach (glue) a small magnet to the back so that the device can hang from a metal surface. Will a magnet have any negative effects on the device?

Asked by: JH720Aero
Thank you for your question. Using a magnet could be an issue and I would recommend using Velcro.
Answered by: Application Engineer PV
Date published: 2023-07-05

Can I log two separate temps continuously with this one unit? Since you discontinued the OM PL-TT I am looking for a replacement.

Asked by: mark1234
OM-72 has one internal and one external temperature sensor. Other options you can consider are OM-DVT4 or ISD-TC. These are not direct replacements of the OM-PLTT, so please read the spec sheets before making your decision. If you have any question please contact our DAS team at or give us a call and ask for the Data Acquisition group.
Answered by: DA Engineer
Date published: 2019-11-21

I have roughly 30 of these that are used. Do you guys buy them back for remanufacturing?

Asked by: Greenwood
Thank you for your inquiry. Omega does not buy back used equipment for re-manufacturing.
Answered by: Application Engineer JB
Date published: 2022-01-20
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Portable Temperature/Humidity Data Loggers with Display
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Portable Temperature/Humidity Data Loggers with Display
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