2 x int. sensors 
2 x integr. in tube
3 x int. sensors 
2 x integr. in tube
2 x int. & 2 x ext. 
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The two humidity/temperatue sensors are integrated in a 100mm stainless steel tube.
It can be attached to the solar radiation screen (YY-31-OM) in order to operate accurately even during rainfall and in direct sunlight.

Download Brochure HERE

YL-RH23E RH/hPaLog with 1 external temperature and humdity sensor and 1 intergrated pressure sensor
Upgraded Memory Humidity Logger YL-RH23E-4M RH/hPaLog
Temperature operating range with standard battery (CR2477N) -30...+70°C
Temperature operating range with high
temperature battery (CR2450HT)
Internal temperature sensor measuring
range & resolution
-40...+90°C & 0.01 K
Humidity sensor (internal & external) 0..100%RH / 0,01%RH
Barometric pressure range/resolution 10 to 1100hPa / 0.1hPa
Barometric pressure accuracy @25°C
Absolute accuracy
Relative accuracy

Dimensions d x h (mm) 50/30
Standard Memory capacity / Upgraded Memory capacity 100,000 readings / 4 million readings
Interval 1 sec to 24 hr/
or Fastmode 4, 2Hz
Enclosure Robust, shock-proof POM, protection class IP65 (dust and spray proof)
Standard lithium battery life 4 years @ 1 min. / 230 days @ 10 sec. / 25 days @ 1 sec.

Included in delivery: Data logger, 1 standard battery, Software YoyoView, USB cable, manual, declaration of conformity

* Using the logger within the extended temperature operating range requires the use of the CR2450HT battery.

Specs YY internal 20_23_25_61_90.jpg

Specs YY external T 20_23_25_61_90.jpg


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Wall Holder Enables you to securely install the logger onto walls. Complete with tamper-evident lead seal.

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Lead seal kit For Temperatue and Humidity LoggersContains 50 pieces of wire and 50 numbered lead tamper-evident seals for single use. These are manually closed around the wire and can only be released by cutting.


YoyoView Software In addition to the functionalities of the included basic software, the optional upgrade allows more complex analysis of data, creation of charts and calculation of data statistics.
» Three scaleable Y-axes
» Zoom function
» Cursor readings
» Display in spreadsheet format
» Combination of a series of measurements in one chart
» Definition of thresholds
» Y/T-charts (values over time)
» Statistics (min, max, and average values)
» Online metering (display actual values)

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Solar Radiation Screen Protecting the external humidity/temperature sensor from the effects of direct sunlight and rainfall when used in out-of-doors. Optimises measurement accuracy in eviromental / climatic data collection.


Environmental monitoring 

Barometric pressure compensating for waterlevel measurements, climate survey for environmental studies, recording in weather balloon

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Ambient conditions in laboratories, calibration laboratories