Question

q11: the proper tool to use for a cooling system acid check is a __________. refractometer multimeter hydrometer pressure tester

Explanation:

A hydrometer is used to measure the density of liquids, which can help in checking the acid - content in a cooling system. A refractometer measures the refractive index mainly for concentration of solutions not specifically for acid - check in cooling systems. A multimeter measures electrical properties like voltage, current, and resistance. A pressure tester checks for pressure in the system, not acid levels.

Answer:

hydrometer