I have used this style before and they last a long time. Only reason why it wasn't a 5 star rating was becauce the tool came about 5 PSI out of spec. The tool I learned can be calibrated yourself fairly easily. I couldn't find a youtube video on it but the procedure is pretty strait forward you will have to disassemble the gauge portion of the tool. Just compare the readings to a known good tire gauge after each adjustment untill they read the same. The only tools I used were a medium sized and a pocket sized screw driver.  NOTE: It is probably a good idea to calibrate this at about the middle of max and min pressures.