The key introduction OFF/ON(start up ,shut down key):when press this key,turn on the power,appear measuring interface.Press this key again can shut down gauge.ZERO(zero key)The testing value on the screen can be zero when click this key. UNIT( switch unit key)It can switch three different unit s when click this key. This product is a simple push pull force gauge with high performance.1.Digital display,easy reading;2.In light weight,small size,easy to carry;3.Unit display:Lb,Kg,N4.The battery has over-load protection in case of short circuit and leakage of electricity .It also can tell you when the battery is running low.It adopt the 3.7V lithium battery and auto shut off with no operation in 10 minutes at the same time. Screen display1.Peak mode: After turn on,enter into the measuring interface,click SET button can enter into the peak mode directly,record the Max. force value during measuring.2.Push pull force shows:do not move the gauge,the above arrow shows the pull force,the below arrow shows the push force.3.Measuring force value display.4.Three units:N(newton),kg(kilogram),lb(pound) display respectively ,press UNIT button to switch .5.Power display.