Microprocessor-based portable universal circular chart “superecorder” comes in 4 models: Temperature and relative humidity; dual thermocouple; dual process; and pH and (RTD) temperature. Keypad for programming and dual backlit display located on front panel. RS232 PC interface allows user to download recorded data. Patented features include double-sided chart paper and magnetic hub. Temperature/relative humidity model (CTXL-TRH) comes with Windows-based PC application software to log data in real time, download recorded data, or re-scale chart paper. Wireless temperature/relative humidity probe is optional. Price starts at $795.