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Physical Environment Monitoring (PEM) is important for our laboratory.
Accelerometers allow us to monitor the seismic activity.
Particle Counter allows us to monitor the amount of particles in the interferometer room and the inside temperature.
[http://lhocds.ligo-wa.caltech.edu:8000/40m/Weather_Station Weather Station] allows us to monitor the outside weather conditions (external temperature, pressure, humidity, wind speed and direction), and the inside temperature.