Compact DesignLED IndicatorBattery Life Indicator

The RHTemp101A is a compact, humidity and ambient temperature data logger. Includes ISO17025 accredited calibration certificate. Read More >

Key Features:

    • Compact Size
    • 10-Year Battery Life
    • Programmable Alarm Limits
    • Precision RTD Sensing Element
    • Memory Capacity of 1,032,192 Readings Per Channel

Availability: 5-7 Business Days



The RHTemp101A is a compact, humidity and ambient temperature data logger. This device can measure and record temperatures from -40 °C to 80 °C (-40 °F to +176 °F) and humidity from 0 %RH to 95 %RH.

The RHTemp101A features user-specified high/low alarm limits and can even be programmed to start up to 18 months in advance. With a 10-year battery life and the ability to store up to 1,032,192 time and date stamped readings, the RHTemp101A is perfect for long-term studies.

The RHTemp101A is compatible with the latest MadgeTech 4 Software making starting, stopping, and downloading simple and easy. Graphical, tabular, and summary data is provided for analysis and can be viewed as customizable engineering units.


Memory1,032,192 readings (all channels enabled)
Reading Rate 1 reading every second up to 1 reading every 24 hours
Alarm Yes, Humidity
Baud Rate 115,200
LED Indicators Red & Green
Push-Button Start Yes
Battery Life 10 years typical at a 15 minute reading rate
MaterialABS plastic
Dimensions1.4 in x 2.2 in x 0.6 in (35.1 mm x 54.1 mm x 14.8 mm)
Operating Environment -40 °C to +80 °C (-40 °F to +176 °F), 0 %RH to 95 %RH non-condensing
Required Interface Package IFC200


Temperature Sensor Precision RTD Element
Temperature Range -40 °C to +80 °C (-40 °F to +176 °F)
Temperature Resolution 0.01 °C (0.018 °F)
Temperature Calibrated Accuracy ±0.5 °C (±0.9 °F)
Temperature Calibrated Accuracy Range0 °C to +55 °C (32 °F to 131 °F)


Humidity Sensor Internal semiconductor
Humidity Range 0 %RH to 95 %RH
Humidity Resolution 0.1 %RH
Humidity Calibrated Accuracy ±3.0 %RH
Humidity Accuracy Range25 % RH to 75 % RH, 20 °C to 40 °C, Hysteresis Error 1 % Typ 3 % Max
RH Units %RH, dew pt., water vapor, concentration (mg/hl)


RHTemp101A Data Sheet

RHTemp101A Product User Guide


Part Numbers

RHTemp101A — 901499-00