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This Tiltmeter from the company PNI and the sensor is the fieldforce-tcm. All information is copied from the homepage of the company.
box, usb-rs232 converter, usb-plug + cap, sensor
https://github.com/mkoval/FieldforceTCM
http://www.pnicorp.com/products/fieldforce-tcm
http://sine.ni.com/apps/utf8/niid_web_display.model_page?p_model_id=18070
http://answers.ros.org/question/10546/pni-digital-compass-driver/#16791