Hair-care appliance with hair-moistness measurement by measuring the resistance of the hair, and circuit for converting the resistance value of a resistor into a measurement signal

A hair-care appliance comprising:

• hair-styling means;
• an electric heating element for heating the hair-styling means;
• electrodes which enter into contact with the hair to be groomed during use of the hair-care appliance;
• and a measurement circuit, electrically connected to the electrodes for measuring a resistance value of said hair (R.sub.x) obtained by measurement of the resistance of said hair that is in contact with said electrodes and for converting said resistance value into a measurement signal indicative of the moisture content of the hair, wherein the measurement circuit comprises:
• a voltage source connected between a first terminal and a first electrode of said electrodes;
• a first resistor connected between the first terminal and a second electrode of said electrodes;
• a second resistor connected between the second electrode and a second terminal;
• and a converter for converting a signal current through a current path from the second terminal to the first electrode into the measurement signal.