This data-logging meter tracks up to three indoor air quality parameters at once, covering oxygen, carbon dioxide, carbon monoxide, temperature, and humidity through separate plug-in probes. Readings can be stored manually or set to auto-log at intervals from one second to eight hours onto a built-in SD card, then pulled off as an Excel-ready file without extra software. The kit ships with CO, CO2, and O2 probes, a hard carrying case, batteries, and includes a NIST-traceable calibration certificate for verified accuracy.