They are totally sealed from the outside environment with an IP64 rated PBT housing and are easily incorporated into trace-heating systems. Available down to -10oC with accuracies to ±1.5K and differentials down to 3±1K, very accurate, long-term control can be guaranteed using a Matsuo thermostat.
This makes them particularly suitable for applications in isolated sites (e.g. CCTV cameras, tv/radio masts, wind-turbines) where the maintenance costs are very high when inferior quality thermostats prematurely fail.