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Micro Relative Humidity & Temperature Data Logger



Volume discounts available
Volume Discount Schedule
Quantity Price each
1-4 $400.81
5-9 $380.77
10-24 $372.75
25-49 $356.72
50-99 $348.70
100+ $340.69

In stock

Lead Time (If not in stock): 8 weeks
Micro Relative Humidity & Temperature Data Logger OM-CP-MICRORHTEMP OM-CP-MICRORHTEMP
  • Miniature Size
  • Low Power Technology
  • Programmable Start Time
  • Real Time Operation


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

The OM-CP-MICRORHTEMP is a miniature, battery-powered, stand-alone temperature and humidity data logger. This device combines the latest in low-power technology with Windows based software to provide a next-generation temperature and humidity recorder. The data logger records 16,383 humidity and 16,383 temperature measurements simultaneously.

The OM-CP-MICRORHTEMP is a major leap in both size and performance. Its real-time clock enables all data to be time and date stamped. The storage medium is non-volatile solid state memory, providing maximum data security even if the battery becomes discharged. Its small size allows the device to fit almost anywhere.

Data retrieval is simple. Plug it into an available COM port and the easy-to-use Windows software does the rest. The OM-CP-MICRORHTEMP requires minimal effort to configure and control. The software used to operate the OM-CP-MICRO-RHTEMP requires no programming skills and enables users to effortlessly select reading rate and device ID. Data collection can start moments after connecting the hardware. A simple plug-in connection is all that is required to connect the OM-CP-MICRORHTEMP to a PC. Data can be printed in graphical and tabular format or exported to a text or Microsoft Excel file.


Temperature Sensor: Semiconductor
Temperature Accuracy: 0.5°C
Temperature Resolution: 0.1°C
Temperature Range: 0 to 50°C
(32 to 122°F)
Humidity Sensor: Semiconductor
Humidity Accuracy: 3% RH
Humidity Resolution: 0.95% RH
Humidity Range: 0 to 95% RH
Calibrated Accuracy: ±3% RH
(±2% RH typical @ 25°C)
Response Time: 90% change in 60 seconds in slow moving air
Accuracy Range: 10 to 80% RH, 10 to 40°C
Calibration: Digital calibration
is available through software
Recording Interval: 30/minute to 1/day
selectable through software
Start Time: Software programmable start time
and date (up to six months in advance)
Alarm: programmable high and low limits
Real Time Recording: Device may be used with PC to monitor and record data in real time
Activity Indicator: Green LED blinks
every 15 seconds to indicate
device has been started

Power: 2 miniature 3 V lithium batteries
(loggers with serial #’s lower than M30000) or two 1.55 V silver oxide coin cells (loggers
with serial #’s M30000 and higher) included
Battery Life: 1 year typical
(15-minute reading rate, 25°C
Time Accuracy: +1 minute per month at 20°C
Data Format: Date and time stamped,
°C, °F, °K, °R, %RH, dew point, vapor concentration
Temperature Alarm: Programmable temperature alarm with high and low limits selectable in software;
when logged data reaches or exceeds either limit,
the red LED blinks every three seconds
Weight: 30 g (1 oz.)
Computer Interface: PC serial or USB
(interface cable required, 38,400 baud
Software: XP SP3/Vista and 7 (32 and 64-bit)
Operating Environment: 0 to 50°C
(32 to 122°F) 5 to 95% RH non-condensing
Dimensions: 15 mm dia x 38 mmL
(0.60' x 1.5')
Material: Stainless steel
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Rated 1 out of 5 by from Horrible battery life I purchased this a couple months ago, but was not able to use it because the cables required to actually operate it (which also had to be purchased separately) to an additional 6 weeks to arrive. The data logger arrived with dead batteries, which I though was strange, but maybe not totally unusual. It turns out that they were likely dead because the battery life is only 2 - 3 days. Once the cable arrived, I installed three fresh batteries, set up the logger to record every 20 minutes and let it run over a weekend. When I tried to download the data on Monday morning, I couldn't. The software couldn't find the datalogger. Apparently if the batteries are dead, you're completely out of luck, even for downloading the data. Terrible design, especially for over $400 (including cables).
Date published: 2016-02-09
Rated 5 out of 5 by from Used for years We have used these for years, and they are still going strong, very good product.
Date published: 2023-02-07
Rated 1 out of 5 by from Use them every day, oh well Have been using these for testing in production for a few years. Very clumsy way to get data. You need new batteries or data is not reliable. The data download is slow for such a pricey USB coms cable. I need to close the software after a few downloads in order to establish comms with a sensor frequently.
Date published: 2020-01-08
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Accessories & Software
Replacement 3.6 V lithium battery for OM-CP-MICROTEMP
29 In Stock
Replacement 1.55 V silver oxide coin cell (loggers requires 2) for OM-CPMICRORHTEMP
0 In Stock
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