Key benefits Accurate, all-in-one measurement: monitors carbon dioxide (CO2), temperature and humidity simultaneously so you get a complete picture of indoor air quality at a glance. Better ventilation decisions: real-time CO2 readings help you identify poor ventilation and take action to improve air circulation and comfort. Ready when you need it: automatic shut-off conserves battery life so the meter remains available for regular spot checks and ongoing monitoring. What it does Three-in-one handheld CO2 meter that reports CO2 concentration, ambient temperature and relative humidity in one device. Two-line dynamic LCD displays all three readings at the same time, eliminating the need to switch modes or scroll through values. Built-in battery-safe function (automatic shut-off) to extend operating time between charges or battery changes. Key attributes Function: simultaneous measurement of CO2, temperature and humidity. Display: two-line LCD that shows all measurements concurrently for immediate interpretation. Portability: lightweight, handheld design for easy transport and spot checks across locations. Use environments: designed for indoor monitoring in homes, schools, offices and similar settings. Performance: real-time readout for quick assessment of air quality and comfort conditions. Practical applications Classroom monitoring: quickly check CO2 levels during lessons to decide when to open windows or adjust ventilation. Office and meeting rooms: verify air quality in shared spaces to optimize ventilation and occupant comfort during extended meetings. Home environment checks: monitor nursery, living spaces or home offices for balanced temperature and humidity along with CO2 levels. Why choose this meter Simple, reliable measurements of the three most relevant indoor air parameters in a single, easy-to-carry tool. Clear simultaneous display reduces user error and speeds decision-making about ventilation and comfort. Battery-saving auto shut-off helps ensure the meter is available when needed without frequent charging. Specifications kept as provided: handheld 3-in-1 CO2 meter with simultaneous CO2, temperature and humidity measurements, two-line LCD displaying all three readings, automatic shut-off battery-safe function, lightweight and portable for homes, schools or offices.