Which of the following tools should a scientist use to measure an object in milligrams? a. Electronic balance b. Pan balance. c. Tape measure d. Thermometer

c. Tape measure.

Explanation:

Here in this case we have to measure the length of the object (distance) so we need to use tape measure.

Tape measure is a device used to measure small distances. It consists of ribbon of clothes, plastic, fiber. glass or metal strip with linear measurement markings. rest all options do not measure length.

electronic balance

Explanation:

Milligram is the unit to measure the mass. It is the very small unit of mass.

1 mg = 0.001 g

To measure the mass which has the order of milligram, we choose electronic balance. It is to be measured accurately by using the electronic balance.