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2 Channel Handheld Humidity K Type Thermocouple Datalogger

Humidity Temperature Meter


Item# HH311

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-4 C$330.00
5-9 C$313.50
10-24 C$306.90
25-49 C$293.70
50-99 C$287.10
100+ C$280.50

In stock

Limited Stock
Humidity Temperature Meter HH311 HH311
  • DISCONTINUED, replaced by HH414

  • Triple Display
  • Temperature/Humidity Probe
  • Second Temperature Input
  • RS232 Interface
  • Timer and REL Functions
  • MIN MAX HOLD Functions
  • Resolution 0.1
  • NIST Certificate
  • Auto Power Off

HH311 Model Options

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Input Type
Minimum Temperature Measurement
Maximum Temperature Measurement
Input Connection Type
Display Type
Accuracy Value
Supply Power
Number of Channels
Communications Protocol

The HH311 is a low cost, high performance handheld meter. It offers a triple display to show the temperature and humidity from a handheld probe and can display data from a separate K type thermocouple connected via a standard SMP type miniature connector to the T2 input. The temperature/humidity probe uses a semiconductor and polymer capacitive sensor. An optional software package is offered to allow data to be read by a PC through the RS232 port.

Range: 0 to 100% RH, -20 to 60°C (-4 to 140°F)
T2 Range: -200 to 1370°C (-328 to 2498°F)
Resolution: 0.1 (except T2 for -200 > T2 > 200)
Accuracy: ±2.5% RH at 25°C, ±0.7°C (±1.4°F)
T2 Accuracy: ±[0.5% rdg ±1°C (2°F)]
Humidity Response Time: 75 sec in slowly moving air
T1 Response Time: 40 sec in slowly moving air
Meter Dimensions: 186 H x 64 W x 30 mm D (7.3 x 2.5 x 1.2')
Probe Dimensions: 190 x 15 mm (7.5 x 0.6'), cable stretches to 1.5 m (5')
Operating Environment: 0 to 50°C (32 to 122°F), 0 to 90% non-condensing
Storage Environment: -10 to 60°C (14 to 140°F), 0 to 80% non-condensing
Power Requirements: One 9V battery (included), AC adapter 9 Vdc 10 mA min
Plug Diameter: 3.5 x 1.35 mm
RS232: 9600 bps, N, 8, 1 serial interface
Battery Life: Approx 100 hours with alkaline battery
Weight: Approx 320 g (11.3 oz)
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Rated 5 out of 5 by from Best value For the money, the HH311 cant' be beat. They are reliable, repeatable, and accurate. We have several in our shop and will continue to use them!
Date published: 2016-06-25
Rated 5 out of 5 by from Well designed and packaged I purchased this last week and am very satisfied that I did. Works well. Easy to use. It appears that the reading is accurate. The unit came with a RS232 connector for data logging. Software included.
Date published: 2019-01-28
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could i connect this device with a USB to my PC r just RS 232

Asked by: moun1992
Hi Maha12 Thank you for the inquiry. Interface is RS232. Software and cable are sold separately on this model. Please consider the new HH414 which includes software and USB cable; https://www.omega.com/en-us/temperature-measurement/temperature-and-humidity-and-dew-point-meters/p/HH414-Meter Best regards OMEGA
Answered by: NorwalkAE_RS
Date published: 2020-12-31

Does the HH311 come with a traceable NIST certificate?  Not just a generic postcard saying it’s traceable to nist. If not how can I add a level cal-3 to this item? It should be an option displayed at checkout?

Asked by: RVLH
The NIST Certificate that is sent out with the meter is the postcard version you describe. In order to get the full NIST Certificate you would use part number HH311-CAL-3 which you can enter and add to the cart if ordering on line.
Answered by: ANB ENG
Date published: 2020-06-08

Hi, could it be connected with a USB or just RS 2032?

Asked by: moun1992
Hi Maha12, Software and cable are sold separately. There is an adapter cable version which allows connection to Windows 7 64 bit. HH414 includes software and USB cable https://www.omega.com/en-us/temperature-measurement/temperature-and-humidity-and-dew-point-meters/p/HH414-Meter Best regards OMEGA
Answered by: NorwalkAE_RS
Date published: 2021-01-02

Is this a calibrated device and does it come with a certificate of calibration? If it has a cert how long is the cert good for?

Asked by: Izzy
Thank you for your inquiry. This model is fully calibrated and is supplied with a NIST certificate valid for one year.
Answered by: Application Engineer JB
Date published: 2019-07-12

Hi, i want to know what 's the range of temperatures and humidities that this device can mesure because I don't know why it's written in the description max and min temperature -200°C

Asked by: moun1992
The HH311's wand probe has a measurement range for RH and temperature of -20 to 60C and T2 the Thermocouple input can measure from -200C to 1370C.
Answered by: Applications Engineer ANB
Date published: 2020-12-17
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