... record the time and some parameters (like temperature, moisture, Light, CO2, etc.). If you choose automatic mode, we should set a ... -I) Record time interval: 5 seconds -90 hours continuously adjustable Sensor communication: RS485 Resolution: 1ppm Computer Communication: USB1.1 Accuracy: ±50ppm ... batteries, 9V/2A power source. Stability: <30ppm/yr Handheld Portable CO2 Meter