chapter 1 Introduction to Electrochemistry of Solid Electrolyte Gas Sensors -- chapter 2 Mathematical Modeling of Zirconia Gas Sensors with Distributed Parameters -- chapter 3 Metrological Characteristics of Non-Nernstian Zirconia Gas Sensors -- chapter 4 Zirconia Sensors for Measurement of Gas Concentration in Molten Metals -- chapter 5 Manufacturing Technologies of Zirconia Gas Sensors -- chapter 6 Errors of Measurement of Zirconia Gas Sensors -- chapter 7 Organization and Planning of Testing Zirconia Sensors.