Upper Air Radiosondes RS41 and RS41 E-models

Most accurate

Exceptional temperature, humidity and wind measurements even in the most challenging conditions.

RS41 E-models

Feature 66% less plastics, same world-class performance with biodegradable mechanical parts.

Trustworthy in clouds

Accurate temperature and humidity measurements even when emerging from dense clouds.

100% consistent BUFR messages

Vaisala manual and automatic sounding systems provide high-resolution BUFR messages that maximize the value of data.

Ease of use

Convenient automated ground check with reliable and intuitive software.

#1 in GRUAN

The most widely used as the GRUAN reference grade radiosonde.

Seamless integration with existing systems

Unlock multi-GNSS support & message authentication with the Vaisala Cirrus Sounding System MW51

Protection against cyberthreats

Industry-first message authentication ensures radiosonde messages remain unaltered during transit

Resilience against interference

60% improved data availability* with multi-GNSS support * Based on Vaisala test soundings in Finland during 2024 comparing the radiosonde RS41 models with and without multi-GNSS.

66% less plastic

Using biodegradable and plastic-free Vaisala BioTwine™ and Vaisala BioCover™

Biodegradable mechanical parts

Including cover, insulation, fasteners and string pin

Same world-class data

Performance is equal to the standard Vaisala Radiosonde RS41