① Choose something that is easy to carry.
The tire pressure gauge should be easy to carry, so that it can be put in the car without occupying any space, so that it can be taken and put away. If the tire pressure gauge is too long and too big, it is inconvenient to use. Generally, small and practical ones are better.
② Select the meticulous scale.
Some inferior tire pressure gauges have a rough scale ratio, and they don't match the number. You should choose a finer scale, so that it will be more accurate to measure tire pressure. The scale should be clearly visible, but it's not fuzzy.
③ Select the tire pressure table with multiple values.
Generally, tire pressure gauges have kilopascals (kPa), psi, bar and other values, so you can choose the commonly used measurement methods by yourself.
According to the data, 70% accidents on expressways are caused by tire pressure. Data prove that TPMS (Tire Pressure Monitoring System) can effectively prevent tire explosion, and its importance can be compared with airbag. Installing tire pressure monitor can save your life at the critical moment. I didn't pay much attention to tire pressure monitor before, until after a tire was punctured, I experienced high speed and changed my opinion.
I remember driving on the highway once, and occasionally I felt something strange in the process of driving. I felt that the tires of the car were a little shaky, not as stable as usual. I didn't care much at that time, thinking that it might be caused by uneven roads. When I got home safely, I found that the tire of the right front wheel was obviously flat. After testing at the tire repair shop, I found that a nail had been tied and the tire had been leaking slowly. In retrospect, this incident really scared me, and I almost had an accident.
Since the tire pressure monitor is so important, how to choose it?
Manual tire pressure gauge
Manual tire pressure meter is to take out the monitor meter before driving out, put it on four tires in turn for testing, and then drive out after confirming the safety. The advantages of manual tire pressure meter are: it is easy to use and cheap, and you can buy it for only about $6. However, the shortcomings are obvious. It is necessary to manually measure the tire pressure before each high speed, and it is easy to forget. If you don't bother, a manual tire pressure meter will be a good choice.
External tire pressure gauge
The structure of external tire pressure gauge generally includes four external sensors, a signal receiver and anti-theft screws. Although the external tire pressure gauge is external, its accuracy is no problem. The advantage is that it is easy to install. For those who want to save trouble, it is a good choice, and you can install it yourself directly. During installation, it should be noted that the sensors should correspond to the positions of the four tires one by one, otherwise it is impossible to confirm which tire pressure corresponds to.
Of course, there are some disadvantages. The external tire pressure is installed outside the tire, which is often exposed to the sun and rain, and may be easily damaged after a long time. Every time you inflate, you need to unscrew the anti-theft screw to inflate. The external tire pressure gauge is also easy to be stolen. Although the anti-theft treatment has been done, the small wrench can still be unscrewed.
Built-in tire pressure meter
Personally, I recommend the built-in tire pressure meter, and I choose the built-in tire pressure meter myself. The built-in tire pressure meter is installed inside the tire, and the installation is complicated, so it needs to be installed in an offline repair shop. There are also many brands of built-in tire pressure gauge. I specially asked the master of the auto repair shop and recommended the built-in tire pressure gauge to me. I also made the following investigation myself.
The structure of the built-in tire pressure gauge is similar to that of the external one, with four sensors and one receiver. The receiver has its own battery, and when there is sunshine, it is powered by solar energy. When the tire pressure is insufficient, the receiver will sound a warning.
When the car is stationary, the tire pressure meter will automatically sleep, so it doesn't need to be turned off manually. When it detects vibration, it will automatically turn on, which is convenient to save electricity. The tire pressure gauge can detect the temperature and pressure of the tire, and the screen uses a color display, which does not affect the viewing and use at night.
The installation of the built-in tire pressure gauge is the same as the installation of the external tire pressure gauge, and the sensors and tires need to be in one-to-one correspondence. The car master needs to replace the original valve in the tire with a sensor with a built-in tire pressure gauge. After the replacement, it needs to be dynamically balanced.
The value of the built-in tire pressure gauge is more accurate, and its life span is longer. The life span of the built-in tire pressure gauge can reach 5 ~ 6 years. Although the price is much more expensive, longer usage time also means higher cost performance. Some people say that the importance of tire pressure gauge may be more than that of airbag. I think this is not unreasonable. Nowadays, every time I drive, there is constant monitoring of the tire pressure meter, which gives me a sense of sureness and peace of mind in the car.