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Bluetooth Module HC-05

It is used for many applications such as wireless headsets, game controllers, wireless mouse, wireless keyboard and many other consumer applications.

Its range is up to

The performance characteristics of the measuring instrument are classified as static and dynamic characteristics. Error is one of the stable characteristics. The difference between the true value and the measured value does not change over time. The true value is the average of an infinite number of measurements, and the measured value is the exact value.

The errors that arise during any measurement are called measurement errors. The error can arise due to many reasons.

Types of Measurement Errors
Measurement errors can be classified into the following five types.

Constant Errors
Systematic Errors
Random Errors
Absolute Errors
Relative Errors

A voltmeter is an electrical component (voltage) measuring instrument that measures the amount of voltage at any two points in an electrical circuit. The units of voltage are volts and the measuring device is a meter that measures voltage by calibrating it to volts, millivolts (0.001 volts), or kilovolts (1,000 volts).

A voltmeter has a high internal resistance which is used in measuring the potential difference between two points of a circuit. In this way, the flow of current is controlled by the measuring instrument. This allows the device to take accurate readings of the voltage.

On the basis of the type of voltage voltmeter can be classified into the following two types:

DC Voltmeter.
AC Voltmeter.