The tools you use on the road of life are important to have. What is your most important tool?
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
To send a letter, you use tools like a pen or paper.
It is a tool for scientific experiments.
Do you have all the tools that you need for tomorrow's construction?