David W Spitzer: The Consumer Guide to Capacitance and Radar Contact Level Gauges
Perry S. Marshall and John S. Rinaldi: Industrial Ethernet, 2nd Edition
Alan S Morris: Measurement and Instrumentation Principles, Third Edition
Norman A. Anderson: Instrumentation for Process Measurement and Control, Third Editon
David W. Spitzer and Walt Boyes: The Consumer Guide To Non-Contact Level Gauges