Humidity Loggers 2YL-RH20-4M 2YL-RH20E-4M 2YL-RH23-4M 2YL-RH23E-4M 2YL-RH24-4M 2YL-RH24-E-4M
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2YL-RG23-4M Humidity Logger

Integrated temperature, humidity and pressure sensors. 4 Million readings, measuring range -40 to +90ºC, IP65 rated.

Supplied with YoyoLog View software, USB lead and long life battery.

Key Features
• Rugged IP65 housing
• Ideal for Ambient RH and Pressure measurement
• Status LED: - Indicates Alarm
- Low Battery Warning
• 2YL-RH23-4M: Internal Humidity, Temperature and Barometric Pressure sensors externally. Internal Barometric Pressure

Download Brochure HERE

Dimensions (d x h) 50 x 33
Ambient temperature range -40 to +90
Measuring range -40 to +90
Accuracy ±1.5 hPA/±0.5 hPA
Internal sensor resolution 0.01
Memory capacity (readings) 4 million
Active start
Sensor type Built in Temperature, RH and Pressure

Humidity Sensor
(Internal abd External)

0 to 100% RH/0.01% RH
Barometric Pressure Range & Resolution 10 to 1100 hPa/0.1 hPa
Intervals 1 second to 24 hours or Fastmode 2 Hz
IP rating 65
Battery type LITH-12

Battery life (Logging Speed)
1 minute

4 years
10 seconds 230 days
1 second 25 days
Robust, shock proof

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

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)




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