The Extech SDL500 Hygro-Thermometer records data on an SD card in Excel® format for easy PC transfer and analysis. It stores up to 99 readings manually and 20M readings via 2G SD card. The SDL500 features type J and K thermocouple inputs for high temperature measurements.

Key features include adjustable data sampling rate (1 to 3600 seconds), data hold, auto power off with disable function, large backlit LCD display, and built-in PC interface. Ideal for long-term environmental monitoring, HVAC system evaluation, and industrial process tracking where data logging capability is essential.