For safety you need to check your tire pressure as low tire pressure results in decreased fuel economy, poor tire wear, poor vehicle handling and can be dangerous. Auto and tire manufacturers recommend you frequently monitor your tire pressure and maintain it to their specifications.
I recently got to review NorthONE Tire Gauge as it is small enough to fit in your glove box or in the tool box in the trunk of your car as the size is 1 x 2 x 5.5 inches. This has four ranges PSI 0-100, Bar 0-7, kPa 0-700 and kg/cm 0-7 and High visibility backlit digital display is quick, accurate and easy to read, day or night. Bright LED Lighted Nozzle for low light conditions. This runs on 1 CR2032 and 3 LR44 Batteries.
My Opinion: This is very bright and easy to read to check tire pressure day or night and works effectively and quickly. I really enjoyed using in and the size is small enough for me to stash in my vehicle but only in the warm months as the cold months I fear will drain the battery quickly.
To learn more visit http://northone.us/products.html
You can purchase on Amazon at the following link http://www.amazon.com/gp/product/B00OPMIR2M
Disclaimer: I was in no way compensated for this review and this is solely my own opinion which may differ from yours.