chapter 1 Introduction -- chapter 2 Semiconductor physics: a summary -- chapter 3 Galvanomagnetic effects -- chapter 4 Hall plates and magnetoresistors. Basic properties -- chapter 5 Hall magnetic sensors -- chapter 6 Hall devices as means for characterizing semiconductors -- chapter 7 Magnetic-sensitive field-effect and bipolar devices -- chapter 8 Comparing Hall sensors with other galvanomagnetic sensors.