Examine samples to verify qualities such as clarity, cleanliness, consistency, dryness, or texture.
Test samples to determine viscosity, acidity, specific gravity, or degree of concentration, using test equipment such as viscometers, pH meters, or hydrometers.
Draw samples of products and conduct quality control tests to monitor processing and to ensure that standards are met.
Test gas, chemicals, and air during processing to assess factors such as purity and moisture content, and to detect quality problems or gas or chemical leaks.