Multi loggers 2YL-M36-4M 2YL-M37-4M 2YL-M61-4M 2YL-M62-4M 2YL-M90-4M 2YL-M90E-4M 2YL-M91-4M

2YL-M91-4M Multi Input Logger

Datalogger with integrated sensors for humidity, temperature, light and barometric pressure as well as two sockets for external probes and signals. 4 Million readings, operating range -40 to +90ºC, IP65 rated.

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

Key Features
• Rugged IP65 housing
• Status LED: - Indicates Alarm - Low Battery Warning
• Accepts 2 x External Probes
• Multi function logger
• Intergrated Barometric Pressure, Temperature and Humidity sensors

Download Brochure HERE

Dimensions (d x h) 50 x 33mm
Ambient temperature range -40 to +90ºC
Measuring range -40 to +90ºC
Internal sensor resolution 0.01K
Memory capacity (readings) 4 million
Active start
Sensor type Internal Temperature/Humidity, Pressure + Light

Humidity Sensor
(Internal and External)

0 to 100% RH/0.01% RH

Barometric Pressure Range
+ Resolution

10 to 1100 hPa/0.1 hPa


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.

** Higher voltage levels up to 24Volts require the YY-CP cable.

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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 Loggers contains 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)


Note: Optional Extras include - YoyoView Software, Calibration Certificate, Wall holder, Lead Seal Kit, Probes and Accessories.



Test and measurement 

Uptime monitoring of harbour cranes, photovoltaic systems. Tyre manufacturing, raingauge, water supply counte


Weather monitoring

Monitoring outside temperature / humidity and via connected sensors also soil moisture and  rainfall