Dual Monitoring: All devices measure both temperature (Celsius/Fahrenheit) and relative humidity.LCD Display: Features large, bold digital numbers for easy readability of current environmental conditions.Integrated Clock: Most models include a clock function, often with an integrated daily alarm and calendar (month/date).Max/Min Memory: Standard capability to record and display the maximum and minimum recorded values for both temperature and humidity.Battery Powered: Typically operate on 1 or 2 AAA batteries with low power consumption for long-term use.