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 1,000,000+ Readings



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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 1,047,552 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.


Memory1,047,552 readings
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
Dimensions1.4 in x 2.1 in x 0.6 in (35 mm x 54 mm x 15 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) from 0 °C to 55 °C (+32 °F to +131 °F)
±1.0 °C (±1.8 °F) from -40 °C to 0 °C (-40 °F to +32 °F) and +55.01 °C to +80 °C (+131.01 °F to +176 °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 Product User Guide
RHTemp101A Specification Sheet

Support Videos

RHTemp101A | Changing the Battery


Part Numbers

RHTemp101A — 901499-00

The RHTemp101A replaces the following products:
TransiTempII-RH — 901763-00
TempRetriever-RH — 901690-00


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