型号 JT-557 激光波长 650（nm） 电源 2X1.5AAA
内有20个大力钩(数量可由客户自定)和一台激光水平仪.
1.Grip hook using your thumb and forefinger.Firmly push pointed end into desired spot on wall.
2.Gently turn hook from side to side untill it penetrates wall.
3.Push all the way in until only hook on the end protrodes.