This is an all-in-one compact, portable, easy to use device that will measure and record up to 262,144 measurements per channel. The storage medium is non-volatile solid state memory, providing maximum data security even if the battery becomes discharged. Thermocouple probe sold separately. Internal Channel Temperature Sensor: Semiconductor Internal Channel Temperature Resolution: 0.1°C Internal Channel Calibrated Accuracy: ±0.5°C Remote Channel Temperature Sensor: Thermocouple Types J, K, T, E, R, S, B ,N Remote Channel Range, Resolution & Accuracy: See Table Cold Jct. Compensation: Automatic Channels: 1 Internal & 1 Remote Memory: 524,288/channel Sample Rate: 1 second up to 12 hours LED Indicator: Red Required Interface Package: IFC110 or IFC200 Baud Rate: 57,600 Typical Battery Life: 2 years Operating Environment: -40~+80°C, 0~95%RH non-condensing Material: ABS plastic Dimensions: 1.7" x 2.3" x 0.8", (44mm x 59mm x 21mm) CE Approval: Yes Range: Remote: Thermocouple Dependent Internal: -40 to +80°C Weight: 2oz.