To answer this question, you need to understand the concept of measuring pressure.
Option A) Saccharimeter - This option is incorrect because a saccharimeter is used to measure the concentration of sugar in a solution, not pressure.
Option B) Ammeter - This option is incorrect because an ammeter is used to measure electric current, not pressure.
Option C) Manometer - This option is correct. A manometer is an instrument used to measure pressure. It consists of a U-shaped tube filled with a liquid (usually mercury or water) and is used to measure the pressure difference between two points, such as in a gas or liquid system.
Option D) Lactometer - This option is incorrect because a lactometer is used to measure the specific gravity or density of milk, not pressure.
The correct answer is C) Manometer. This option is correct because a manometer is specifically designed to measure pressure.