4-in-1 Sensor Temp/RH/Barometric Pressure/Vapor Pressure


Microclimate measurement made simple

If you’re doing a microclimate or evapotranspiration study, you may need up to four extra sensors to get important measurements that will benchmark your data. Not to mention you have to face the hassle of getting all those sensors integrated into your system. What you need is something simpler. With this in mind, we engineered the ATMOS 14 to be four sensors in one—air temperature, relative humidity, barometric pressure, and vapor pressure. And best of all, it’s plug and play with our ZL6 data logger.

With the ATMOS 14, all your bases are covered

Thousands of engineers and ecologists already depend on the ATMOS 14 for straightforward measurements. Whether you’re using the ZL6 to look at plant emergence, leaf area index, or fractional interception, there isn’t an easier way to benchmark your data. The ATMOS 14 is a versatile, low-maintenance, and fast sensor designed to make taking temp/RH measurements simpler and therefore less work.

Plug it in, and walk away

Despite its minimalist design, the ATMOS 14 provides maximum value. While other sensors require wiring and programming, the ATMOS 14 simply plugs into the ZL6 (It’s also compatible with third-party data loggers). There’s no having to figure out complicated instructions. Just mount the sensor on your data logger mast, plug it in, and walk away.

Measures a lot. Requires very little effort.

The ATMOS 14 is low-maintenance. It gives accurate vapor pressure and RH without a lot of cleaning. Plus it’s weatherproof, meaning it will last a long time in the field. Another helpful feature is the compact shape that fits into tight spaces, leaving room on a mast for other sensors.

Readings don’t get any more rapid

Because the ATMOS 14 is plug and play, setup is quick. And responses are equally fast. Thanks to a Teflon protection screen that keeps liquid water out, but vapor moving freely through, it responds rapidly while keeping dust and liquid water off the sensor. Both features add up to time saved on your part.

For everything it measures, there’s not much to it

With ATMOS 14, all your basic microclimate measurements are covered using a small, simple integrated sensor. This versatile, low-maintenance sensor will rapidly and reliably measure air temperature, relative humidity, barometric pressure, and vapor pressure, making benchmarking quick and hassle-free.

Request a quote Contact us Knowledge base ATMOS 14


  • Four measurements in one sensor
  • Plug and play capability
  • Collect data remotely when used with the ZL6 data logger
  • Compact
  • Teflon screen protects the sensor from weather
  • Fast response
  • Integrated temperature for accuracy





0 to 100% RH (0.00-1.00)


0.1% RH


Sensor measurement accuracy is variable across a range of RH. Refer to the chart in Figure 1.

Figure 1. RH sensor accuracy

Equilibration time (τ, 63%)

<40 s (response time in 1 m/s air stream)


< 1% RH, typical

Long-term drift

< 0.5% RH/year, typical



-40 to 80 °C


0.1 °C


Sensor measurement accuracy is variable across a range of temperatures. Refer to the chart in Figure 2.

Figure 2. Temperature sensor accuracy

Equilibration time (τ, 63%)

< 400 s (response time in 1 m/s air stream)

Long-term drift

< 0.04 °C/year typical



0 to 47 kPa


0.001 kPa


Sensor measurement accuracy is variable across a range of temperatures and RH. Refer to the chart in Figure 3.

Figure 3. Vapor pressure sensor accuracy



50 to 110 kPa


0.01 kPa


±0.4 kPa



DDI serial or SDI-12 communications protocol

Data logger compatibility

METER data loggers (ZL6, EM50/60 series) or any data acquisition system capable of 3.6- to 15-VDC power and serial or SDI-12 communication.



Diameter: 2.0 cm (0.8 in)
Height: 5.4 cm (2.1 in)

Operating temperature range

Minimum: –40 °C
Maximum: +80 °C

NOTE: Sensors may be used at higher temperatures under certain conditions; contact Customer Support for assistance.

Cable length

5 m (standard)
75 m (maximum custom cable length)

NOTE: Contact Customer Support if a nonstandard cable length is needed.

Connector types

3.5-mm stereo plug connector or stripped and tinned wires


Supply voltage (VCC to GND)

Minimum: 3.6 VDC
Maximum: 15.0 VDC

Digital input voltage (logic high)

Minimum 2.8 V
Typical: 3.0 V
Maximum: 5.5 V

Digital input voltage (logic low)

Minimum: –0.3 V
Typical: 0.0 V
Maximum: 0.8 V

Digital output voltage (logic high)

Typical: 3.6 V

Power line slew rate

Minimum: 1.0 V/ms

Current drain (during measurement)

Minimum: 4.50 mA
Typical: 4.75 mA
Maximum: 5.00 mA

Current drain (while asleep)

Typical: 0.03 mA

Power up time (DDI serial)

Maximum: 100 ms

Power up time (SDI-12)

Minimum: 100 ms
Typical: 1,100 ms
Maximum: 1,100 ms

Measurement duration

Typical: 550 ms
Maximum: 600 ms


Manufactured under ISO 9001:2015
2004/108/EC and 2011/65/EU

California requires the following notice:

⚠️ WARNING: This product may contain chemicals including ethylene glycol, lead, nickel, styrene and cadmium, which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov


Have a question or problem? Our support team can help.

We manufacture, test, calibrate, and repair every instrument in-house. Our scientists and technicians use the instruments every day in our product testing lab. No matter what your question is, we have someone who can help you answer it.

Email Europe: sales.europe@metergroup.com


Phone US: +1 509-332-5600
Phone Europe: +49 89 12 66 52 0


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