Rion meters are well-suited to long-term measurements because the pre-polarised microphones are less-susceptible to problems caused by damp than pure capacitor microphones.
The Rion microphone weather protection kit is simple, effective and practical - it can be set up on a tripod or attached it directly to a 25 mm outer diameter pole.
No complicated additional calibration precedures.
The meter is protected by a weatherproof lockable case and runs off gel-cell batteries (a simple two battery system will run an NL-31 for 10 days or more).
Proven performance - we have run several Rion meters with outdoor systems continuously for more than 3 years with no failures.
