Dwyer Instruments” EMMA environmental multifunction meter combines humidity, temperature, air velocity, air flow, sound and light measurements into an easy-to-use instrument. The large, dual-line four-digit LCD display shows both the current and average reading. For reading measurements in dimly lit areas, the display has a built-in back light. Besides measuring the current and average reading, the device allows the user to read the minimum, maximum and differential measurement for each of the parameters. Included with the meter is the carrying case, rubber boot, battery, and tri-pod.