ph papers
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More accurately, either pH papers with a colorimeter, or a pH meter that works on the conductivity of the fluid.
It is a simple and not expensive tool to measure pH.
pH meter to measure the acidityruler or caliper for linear dimensionstape measure for the circumferencescale for the masscolorimeter for the hue or colorthermometer for the temperatureGeiger meter for the radioactivity...
You can use a measuring tape, a ruler, or a yardstick to measure your height.
Scale
steel rulemeasuring tapelaser measuring deviceruleyardstick...
A theodolite.
mgs
You should use a pH meter or pH paper to measure the acidity of a solution. These tools provide a way to quantitatively determine the concentration of hydrogen ions in the solution, which correlates with its acidity.
Caliper. Micrometer
measuring tape
I use a fine mark steel ruler.
A pH meter