Which is a incorrect match in the following

Answer: Option D

A hydrometer method is used to determine the particle size distribution of fine-grained soils passing 75 µ sieve. The hydrometer measures the specific gravity of the soil suspension at the center of its bulb. It also measures soil bulk density.
A pycnometer is a small glass bottle of known volume for determining the relative density of liquids and solids by weighing. It helps in Particle analysis of soil.
A permeameter is a tool to measure soil moisture retention, saturated permeability, or K-factor of the soil samples.
A potometer is designed to measure water uptake in a leafy shoot. It cannot estimate soil moisture.