This paper describes the designing of five channels instrument for temperature measurement. This instrument also has differential mode facility so the temperature difference between two points can be determined. This instrument was designed by using 8031 microcontroller for the temperature measurement processes. Generally%2C this instrument consists of two main parts. The first part is 8031microcontroller minimum system and the second one is sensor and transmitter circuit. This instrument uses LM35 temperature sensor and transmitter circuit is used to transmit the signal so the remote temperature measurement can be achieved. Experiment was done and the measurement data was recorded. The maximum error of temperature measurement that can be achieved is 1%B0C. The experiment was also done by using 30 meters transmitter cable and it show good result too.