CO2 ventilation checker RT-56 1 unit

Measures CO2 concentration, temperature, relative humidity and air pressure in real time. Switching the screen will display a graph of the CO2 trend (displaying the CO2 concentration for the last 50 minutes in 10 minute intervals). It has an outside air calibration function that recognizes fresh outside air as 400 ppm, and a temperature correction function. The ventilation status is indicated by color. Green (good): 800ppm or less, Yellow (caution): 801-1499ppm, Red (warning): 1500ppm or more The ventilation rate is calculated and determined using the included software, and compared with the recommended ventilation rate. Continuous measurement is possible while charging via a power outlet (AC100V) or USB port. It can be used for up to about 3 hours on a full charge. CO2 measurement range: 400 to 5000 ppm Temperature range: -10 to 50°C Humidity range: 20 to 85% RH (no condensation) Pressure range: 860-1060hPa Display: Date, clock, battery level, CO2, temperature, humidity, air pressure Dimensions: 96 x 76 x 145mm Weight: 210g Power source: USB port or outlet (AC100V) Accessories: USB cable, AC100V adapter, ventilation rate calculation software (simplified version) *The CO2 display will stabilize in about 5 minutes after turning on the power. If there are large temperature differences, it may take up to 30 minutes for the temperature and humidity to stabilize.