I am using this at home. You can also put in in your car. It displays current temp and humidity, time and also has alarm function and hourly beeps. It also keeps maximum and minimum temperature in memory. I bought this for Rs. 600. I bought this from Lahore from the market that sells chemical and lab equipment, near Urdu bazar.
There is another model that comes with a wired sensor which can be placed outside and it will give you both outside and internal temp and humidity. That one costs Rs. 900.