What is a Precision Scale and How Does It Work?

Precision scales are high-accuracy weighing machine that can measure in milligrams (mg) or even micrograms (µg). They are also known as Laboratory Balance because they can measure small amounts of samples with great precision , and are also preferred in many areas such as pharmacy, jewelry, and industrial production.

What is a Precision Scale?

Precision balances are specially designed measuring instruments that have a much lower margin of error than scales . They work on electronic or electromagnetic principles and can generally perform fine measurements starting from a resolution of 0.1 mg (0.0001 g) down to 0.000001 g. They are used especially in chemistry laboratories, pharmaceutical centers and precious metal weighing. For this reason, the term " laboratory balance " is often heard in environments requiring high precision.

How Do Precision Scales Work?

Many people wonder, “ How does a precision scale work ?” or “ How does a scale provide such high accuracy?” In fact, the operating principle of these devices is based on two basic technologies: load cell and electromagnetic force balancing (EMF).

1. Load Cell Technology

• The weight placed on the scale creates a slight deflection in the metal beam or body.
• Sensors called strain gauges convert this tendency into an electrical signal.
• The digital processor calculates the weight value by evaluating the incoming electrical signal.

2. Electromagnetic Force Balancing (EMF) Technology

• During the measurement, the coil in the magnetic field begins to move due to the effect of weight.
• By applying electric current, a force is given to the coil and balance is achieved.
• The current value passing through the coil corresponds to the weight of the weighed object.

Most advanced laboratory balances , especially analytical balances , adopt EMF technology because it is more sensitive. This technology offers high stability and accuracy, especially when making sub-milligram measurements. 

Importance of Overload and Positioning of Precision Scale

First of all, overload situations should definitely be avoided. Regardless of the maximum capacity of the device, be sure to check the capacity and choose a model with higher capacities if necessary to avoid problems such as " the scale broke down" when weighing products or samples. In addition, the scale should be placed on a flat surface, kept away from vibrations and not exposed to environmental factors (dust, humidity, wind, etc.). This will help you get more accurate measurement results.

Areas of Use of Precision Scales

• Laboratories: Laboratory scales are used to weigh chemical and biological samples .
• Pharmaceutical Industry: Dosage calculations and formula testing require precise models as scales .
• Jewellery: Provides reliable results for weighing precious metals and stones.
• Industrial Production: Small quantities of high-value materials are measured on the scale with great care.
• Scientific Research: Used for experiments requiring nano-level precision.

What to Consider When Choosing a Precision Scale?

• Accuracy and Precision: Choose models that can be calibrated regularly and offer low tolerance ranges.
• Resolution: Choose between analytical or other balance models depending on the measuring range you need .
• Environmental Conditions: In answer to the question of where the scale should be positioned, an environment without vibration and with a constant temperature value is recommended.
• Ease of Calibration: Make sure you can calibrate the device regularly as specified in the user manual .
• Brand and Support: Choose reliable manufacturers that offer parts supply and after-sales service.

Precision scales are vital in areas such as drug formulation, scientific research and jewelry. Incorrect measurements can cause loss of time and increase costs, as well as jeopardize product quality. Therefore,specially designed high-precision devices should be preferred and regular maintenance and calibration should be performed.