Echometer Model M Strip Recorder – 15000 PSI Manual Fire Well Gas Gun. All necessary cables included.
The Model M is a portable dual-channel strip chart recorder that uses acoustics to obtain th e distance to the liquid level in the casing annulus of a well. The device consists of a microprocessor controled dual channel amplifier / recorder and a gas / microphone wellhead attachment.
See attached link for additional documents, features, and specifications:
https://echometer.com/Products/Model-M
https://echometer.com/Products/Gas-Guns/15K-PSI-Gas-Gun