Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A little hard to read

Got this to try to extend the life on my motorcycle tires by adjusting the air to keep the tread depth similar on the middle of the tire and on the sides. It appears I was running too much air and the middle tread was wearing faster than the sides. The gauge is simple and straight forward, however, the scale goes around the cylinder that goes in and out, so if you measure tread depth at one point on the tire, you have to turn the gauge around to read tread depth at another point on the tire if it is more, or less, than the first reading. Also, while you can "guestimate" the depth (good enough for personal use) by reading the lines on the gauge, I would just go for one of the digital depth gauges if I had to buy one again.