恒温器 Traditional form: 恆溫器 Pinyin (reading): héngwēnqì Definitions: thermostat Characters: 恒 - constant, persistent, regular 温 - warm, lukewarm 器 - device, instrument, tool; receptacle, vessel Traditional characters: 恆 - constant, persistent, regular 溫 - warm, lukewarm 器 - device, instrument, tool; receptacle, vessel