The Model HTDL-20/30 is a high-temperature data logger than can measure temperatures up to 500°F. This submersible and portable data logger can record up to 32,700 measurements and has an external probe to ensure fast and accurate temperature readings. The Model HTDL-20/30 contains non-volatile solid-state relay memory that will retain data even if the battery becomes discharged. It can be easily started and stopped from a PC or delayed to start up to 18 months after initialization.