for the control of the carbon dioxide concentration in populated buildings, f. e. schools, offices and public facilities, with temperature indication, 24 hours data logger, adjustable acoustic alarm, open collector, accuracy ±50 ppm or 5 % Range: CO2: 0...3000 ppm wall mounting or table standing, 165 x 26 (55) x 81 mm, 183 g, power adapter included, 4x 1,5V AA batteries included, EK