Internal and external temperature and humidity meter 
 Record the minimum and maximum temperature 
 Measurement of temperature in two different units C & F 
 Measurement of temperature from -50 to 70 degrees 
 Moisture measurement from 20 to 99% humidity 
 Accuracy is 1 temperature and 5% humidity 
 Powered by 1.5V AAA battery 
 Big screen display 
 The possibility of selling it with an optional calibration certificate a