Humidity Loggers 2YL-RH20-4M 2YL-RH20E-4M 2YL-RH23-4M 2YL-RH23E-4M 2YL-RH24-4M 2YL-RH24-E-4M
IMG_0005 copy.png 2YL-RH20-4M

Single integrated temperature and humidity 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 measurement
• Status LED: - Indicates Alarm - Low Battery Warning
• Internal Humidity and Temperature sensors

Download Brochure HERE

Dimensions (d x h) 50 x 30mm
Ambient temperature range -40 to +90ºC
Measuring range -40 to +90ºC
Accuracy ±2% RH and ±0.3
Internal sensor resolution 0.01K
Signal input -
Memory capacity (readings) 4 million
Active start
Sensor type 1 x Temperature, 1 x Humidity

Humidity Sensor
(Internal abd External)

0 to 100% RH/0.01% RH

Barometric Pressure Range & Resolution

Intervals 1 second to 24 hours
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

Supplied with YoyoLog View software, USB lead and long life 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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Environmental monitoring

Room temperature monitoring, water temperature survey (rivers, lakes), outside temperature, research projects involving trees, ice


Logictics and transport

Monitoring of temperature and humidity conditions during transportation and warehousing for various goods such as frozen food, pharmaceuticals, live stock, chemicals


Drying processes

Food processing and manufacture; paint drying processes; curing monitoring



Storage rooms for medical, pharmaceutical products (qualification), chemical products



Humidity monitoring of seeds during production, pharmaceutical products