THERMOMETER Specification: Super big LCD Portable / wallmount SD Card logger measures temperaturevia k type thermocouple. 4 channel k type thermocouple to use at once. Unlimited manual memories in SD Card. Unlimited autologging memories in SD card. Hold function freezes current readings. Cheking max / min value from power on. Beeper and LED alarm are both available. One button press to display T1-T2. Display temperature change from baseline. Programmable temperature high / low alarm limit. Temperature offset function for adjustment purpose. Over-range indication with error messages. Blue backlight function works in dark area. 12 hour / 24 hour time format selectable. Real time display ( year mo-date, hour-min ). 20mins auto power off to save power. Temperature units (C/F) selection. Powered by 4pcs AA batteries or 9V adaptor. Low battery indicator.