A system was designed to monitor and display the temperature of thirteen refrigerators in the hospital's clinical laboratory. The system includes programmable high and low alarms, a panel meter to display temperature, yellow light-emitting diodes (LEDs) for refrigerator indication, red LEDs for high alarms, and green LEDs for low alarms. The system presented here has been in operation for over three years and has been shown to be reliable, inexpensive, and useful for periodic data collection.