(1) The geomantic compass is the only tool to measure the exact sitting direction of yin and yang rooms.
(2) Yin-Yang ruler is a tool to measure the quality of some building structures.
(3) Mo Dou red line or laser transmitter is a tool that must be used to mark the orientation of buildings, and it is often used with compass.
(4) Feng Shui rod ruler is a tool that must be used when designing or referring to the building plan.
(5) Record the data of Feng Shui with notebooks and pens.
These are the basic tools of Feng Shui master. The rest is of little significance.