Nanometrics industry-leading Trillium 120-class posthole seismometer in a slim form-factor 
The instrument is housed in a stainless steel enclosure with high pressure marine grade connector.
Local, regional & teleseismic studies
The Trillium 120 Slim Posthole is a very broadband seismometer ideal for local, regional and tele-seismic studies, having a response of flat to velocity from 120 seconds to 150 Hz and exceptionally low self-noise. Operators will appreciate the low power consumption, remote mass centering and robust no-mass lock design inherent in all Trillium Seismometers. Its many simple-to-use features, such as automatic mass centering that can be remotely initiated, and digital case tilt reporting make for fast and successful installation every time.
Real-Time Tilt and Azimuth Correction
The slim posthole has a wide range tensioner, a ±4° mass-centering range permitting installations in downhole deployments that are up to 4° from vertical. When used with the Centaur Digital Recorder, an innovative real-time tilt and azimuth correction feature permits the digitizer to correct for any tilt and misalignment at the source, eliminating the need for correction downstream.
Also available:
• Trillium Borehole 120 and Trillium Horizon for vault or shallow direct bury