RVFM-Multitype-Thermometer-&-Datalogger-RVFM-502A-Multitype-Thermometer-&-Datalogger-Temperature-Time-Measuring-Parameters-LCD-Display-RS232-Interface-9V-Battery-Power-Source-K-J-T-E-R-S-N-Type-Thermocouples-4-5-Digit-with-Triple-Display-Dual-Thermocouple-Input-Adjustable-T-C-Offset-Safe-Measured-Data-Rec-Max-Min-Max-min-Avg-Rel-Hold-Functions-Time-Record-Interval-Real-Time-Clock-with-Calendar-Selectable-Auto-Power-Off-Function-Easy-Reads-Data-with-Down-&-Up-Keys-o