Wireless humidity sensor

The CMA wireless humidity sensor measures relative humidity between 0 and 100%, and simultaneously measures air temperature. Based on these measurements, it calculates the dew point. The sensor, housed inside a perforated aluminum probe, uses a polymer-based capacitive element combined with a silicon temperature sensor to measure both humidity and temperature.

The humidity sensor is equipped with an OLED color display that shows sensor information and measured values. This makes the sensor suitable for use as a standalone measuring instrument.
The sensor can be used wirelessly via Bluetooth or wired via USB with the Coach 7 or Coach 7 Lite programs/apps on computers (Windows and Mac), Chromebooks, and mobile devices (Android and iOS).

Technical specifications:

• Measuring ranges: humidity 0 .. 100% RH / temperature - 40 .. 125 °C
• Accuracy : ± 2% RH (@0 ~ 80%RH) / ± 0.25 °C (@-40 ~ 60°C)
• Warrantee: 36 months
• OLED display: 0.96” 128 x 64px
• Response time: 15 s at 25 °C in slowly flowing air
• Max. sample frequency: 60 Hz
• Battery life: 12h when fully charged (rechargeable)
• Connectivity: Bluetooth 5, Low Energy (Mac, Android, iOS), Bluetooth 2.1, Classic (Windows), or USB-C 2.0

Full sensor specifications can be found in the Product Manual.

Suggestions for science experiments:

• Measure indoor humidity and temperature over a day to observe daily fluctuations
• Compare humidity levels in different rooms of a school to see microclimate differences
• Track outdoor humidity and temperature changes and correlate with local weather reports
• Measure how quickly a sealed container reaches equilibrium humidity after adding water
• Study the effect of a fan or ventilation on humidity and temperature in a closed space
• Observe dew formation by cooling a surface and measuring the dew point
• Compare humidity readings in warm vs. cold environments to see how temperature affects relative humidity
• Monitor humidity and temperature in a greenhouse or terrarium over time
• Test how well an air humidifier works in different rooms