Down-hole tube diameter and tube position temperature tester

The utility model belongs to an underground cannula testing instrument in an oil field, more particularly relates to an underground caliber and cannula position temperature testing instrument which comprises three-core cables, a hanging ring, a joint, a magnetic locater, a bottom hole thermometer fixing arm, a bottom hole temperature sensitive arm, a pressure equalizer, a right-angle diameter gauge, a diameter gauge contact, a series bridge, an instrument tail cap and a guiding cone. The underground caliber and cannula position temperature testing instrument is characterized in that the hanging ring is connected to a shell; the magnetic locater, the bottom hole thermometer fixing arm, the bottom hole temperature sensitive arm, the pressure equalizer, the right-angle diameter gauge, the diameter gauge contact, the series bridge, the instrument tail cap and the guiding cone are sequentially installed in the shell; three three-core cables are connected to an instrument vehicle on the ground after being respectiv