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graph
thermometer
How do scientific tools help a scientist
variable
The most important tool for any scientist is curiosity and the desire to know. Without this, the scientist is a mere lab technician. The second most important tool for any scientist is patience. The media love to portray scientists being struck by inspiration and having a eureka moment, but even the most inspired scientist has spent long hours in thought and research preparing her mind for that eureka flash of insight.
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graphs
Calculus
It allows biologists to compare different kinds of data!
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radiosonde
To gather passwords from machines running Windows.
thermometer
particle accelerator
Many of the techniques of descriptive statistics fall into the category described by this question. The most obvious ones that fit are the graphical methods.
How do scientific tools help a scientist
You would use a graduated cylinder