2YL-M90E-4M Multi Input Logger (Internal Temp. /Rel. Hum. + External Probes + Extended Temp. / RH)


Grant Instruments


External temperature and humidity sensors 100mm long probe. 2 configurable
channels accept probes for temperature, humidity, voltage, current, luminance, CO2 and more.
4 Million readings, operating range -40 to +90ºC, IP65 rated.
Supplied with YoyoLog View software, USB lead and long life battery.

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Environment of Use Indoor/Outdoor
Type of Logger Miniature
Precision 0.1%
IP Classification IP65
Battery Life 4 years
Memory Capacity 4 million readings

• Rugged IP65 housing
• Status LED: - Indicates Alarm - Low Battery Warning
• Accepts 2 x External Probes
• Multi function logger
• 2YL-M90E-4M: Temperature and Humidity sensors mounted externally

Software YoyoView (YY-100)

The basic software (YY-100), included with the logger, is suitable for configuring the logger, downloading basic data and exporting data. The yoyo logger can be connected to laptop or PC via a USB port.

It is also available for download here:

Dimensions (d x h) 50 x 33mm
Ambient temperature range -40...+90°C *
Measuring range -40 to +90
Accuracy 0.1% of selected measurement range
Internal sensor resolution 0.01
Signal input Free or low level pulses <0.5VDC amd high, between 2 and 3 VDC
Memory capacity (readings) 4 million
Active start
Sensor type

Multilogger - Internal Temperature/Humidity +
External Probes + Extended Temperature/Humidity

Humidity Sensor
(Internal and External)

0 to 100% RH/0.01% RH
Voltage Pulses range 0 to 65000 pulses, interval 0 to 100 pulses per second
Voltage resolution 1Hz, 1 Pulse
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
Suitable Probes PT100/PT1000

* 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. Recording on-board voltage of a racing car or helicopter. All kinds of analogue signals from sensors/transducers. Recording the signal of a CO2-Sensor in a transport box. Tyre manufacturing, raingauge, water supply counter.

  • Electricity Measure

AC current with current clamps

  • Weather monitoing  

Monitoring outside temperature / humidity and via connected sensors also soil moisture and rainfall. Weather station, weather balloon.

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