Because they have outstanding features in a simple measure, the device is small, and inexpensive. It is widely used in the chemical laboratory, medical, food, agriculture, environment and industry.
Because they are outstanding features in a simple measurement equipment smaller, and less expensive. Has been used extensively in the chemical laboratory, medical, food, environmental and agricultural industries.
Because they are featured in the measurement device is small, simple, and inexpensive. Have been used widely in the fields of chemical lab,. Medicine, food, industry, environment and agriculture.