In laboratories, research centres, molecular biology, genetics etc., we need to follow the formulation or to know the weight of samples, which is always determined by instrument of BALANCE. When working in laboratories or research centers the quantity of the sample can be small, precise or sometimes we require samples in large quantity,  for this reasons, a proper balance is required.
Balances are highly sensitive lab instruments designed to accurately measure weight/mass. Used in quantitative chemical analysis, to determine the mass of solid objects, liquids, powders and granular substances.

When using an analytical balance, great care must be taken, or you should following the user manual.

Factors affecting the performance of an analytical balance

1. Temperature

A slight change in temperature results in fluctuation of measurement. As the room temperature rises, the sample either expands or loses moisture.

2.Calibration-

Calibrating an analytical balance ensures accurate readings. Some scales have internal calibration capabilities

3.Air Currents-

Just as temperature and vibration change the measurement of small sample sizes, air currents can affect the complex mechanisms of analytical balances.

4.Magnets-

Some balances use magnets as a part of the weighing system. Therefore, placing the balance near magnetic equipment or weighing magnetic sample can result in erroneous readings.

5.Vibrations-

Vibrations from refrigerators, ventilation systems, and other devices that generate vibration can affect analytical balance accuracy.

Precautions:

• Clean the weighing pan before and after use to ensure that the weighing sample does not get contaminated.

• The balance should be kept calibrated. The standard weights should not be touched with hands.

• Weighing should be carried out in a suitable environment free of vibrations and controlled for humidity and temperature.

• Avoid direct exposure to sunlight and place the balance away from the area of excessive air drafts while weighing.