An extensively used temp. measurement technique at present at home and abroad is based on the property of variation of a quartz crystal resonance frequency with temp.. But existing techniques have not resolved the problem of separating the crystal from the oscillator. The present invention utilizes a domestically produced Y+O deg. cut quartz crystal and a special pulse shaper to form the temp. measuring oscillator; 20 meters of (gamma/2 minus or plus lambda/8) wave length coaxial cable is used to connect them together. By said method, an ideal transducer can be obtained that utilizes the piezoelectric effect of the crystal to measure the temp., pressure and other physical quantities. This invention has developed an intelligent temp. measuring apparatus by utilizing the said transducer in conjunction with microcomputer technique.