The compact REF TEK® Colt-PH™ broadband seismometer provides high quality data for scientists conducting earth movement studies.

Low Self-Noise

Using a force-balance electronic feedback circuit design, the REF TEK Colt-PH has exceptionally low self-noise allowing it to better measure ground motion even at the quietest sites. Scientists requiring portable posthole style seismometers now have a high dynamic range instrument available for quick, easy deployment.


The shock resistant mass locking system protects the instrument during transportation to any field location. And, with a 100m water depth IP68 rating, posthole flooding won’t damage your instrument.

Intelligent Design

Many features make the REF TEK Colt-PH broadband seismometer quick to install.