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The iodine value is the measure of the unsaturation of fats and oils. It is expressed as the number of grams of iodine absorbed by 100 g of the fat under the test conditions used.
A graduated cylinder
Chemists study oxygen, its chemical properties, and reactions involving oxygen Biologists study oxygen - it's availability and how it is used and produced by organisms Environmental scientists study how oxygen levels affect the environment and how the environment affects oxygen levels - including oxygen levels in both the atmosphere and dissolved in water.
The gas that is required to allow rusting to occur is Oxygen
Dissolved oxygen is the current amount of oxygen in the water. A certain amount of Dissolved Oxygen Is needed to keep the fish alive, if any of the dissolved oxygen decreases by either a little or a lot it can cause changes in the water, normally if the dissolved oxygen decreases so do the fish and aquatics life's life.
A=Spirometer(Answered by Teshome Seya)*source-Tbar's medical dictionary.A spirometer is a device that measures the volume of air inhaled and exhaled by the lungs.A spirometer is used to measure breathing.Spirometerspirometeryou donta stethascope. 
Oxygen equipment is used for individuals who need oxygen therapy. These are people who have loss of lung capacity for various reasons such as illness, age, or injury.
Oxygen partially dissolves in water. Respiratory systems of aquatic animals are adapted to get this dissolved oxygen. They have gills for respiration.
You use a spectrophotometer.