Microcontroller Based Operation Theatre Parameter Display is designed for use in hospitals’ operation theatres to keep track of the time elapsed during operation and to monitor the environmental parameters like room temperature and humidity. The Operation Theatre Parameter Display comes with two inch bright seven segment LED displays. The Operation Theatre Parameter Display ensures that alarms for each parameter can be set so that on crossing of the set value it will raise an alarm. Microcontroller Based Operation Theatre Parameter Display also allows for setting up timer alarm to indicate time is running out.