Did it happen to you anytime that you made a project and it didn't work because of faulty transistors or faulty displays. So here is a device with which you can test components like transistor, diodes, LDR, LED, etc. before beginning the project. It is compact and driven by coin cell.

Testing Components Like LED using Multi meter is a mess. However you can't Test Components like Capacitor, Is Transistor NPN or PNP, etc. TESTERA is an exclusive Handy tool which can test your components without any mess. Just Plug them and see results. Specifications of TESTERA are as follows:

Handy Device and can be Carried Easily

Can Hang it on Wall of Tools

Can Check NPN or PNP Transistors

LED Indication

Easy to Plug Components

Long Battery Life

Pocket Sized

Step 1: Testing LED

Here is the circuit diagram for testing LED. When you press the switch, the circuit gets connected and the LED glows if it is working.

We are making with the help of only one battery, so connect all the systems that are coming ahead with one battery!

Can also be used to test IR led.

Step 2: Testing Transistor

Follow circuit diagram for testing transistor. Here using this circuit you can check whether the transistor is PNP or NPN. If the Collector and Base of transistor is short, then it is NPN otherwise the transistor under test is PNP.

LED is there to show indication whether it is NPN or PNP.

Step 3: Testing Other Components

Follow the circuit diagram for testing other components like LDR, Capacitor, diode, tilt sensors, etc. Any component under test can easily be tested due to led indication.

Step 4: Using It!

To Check LED:

Just Plug LED into the LED Section and Press the Button. You will see LED Glowing and if not LED is not Working. Easy Enough!! Moreover you can also test IR LED but for that you need a Camera.

Remember to Check Polarity!

To Check Transistor:

To Check if Transistor is NPN or PNP. Plug the Transistor in Order Of CBE and if LED Glows, Transistor is NPN or else PNP Transistor.

To Check Other Components:

To check other Components, Connect Bipolar Components in Test Area and Follow Table:

Component Indication

Capacitor: LED Glows Brightly and then Dims away

Diode: Glows When Connected in Forward Bias

Resistor: Glows According to Resistance of Resistor

Tilt Sensor: Glows and when tilted upside down

LDR: LED Glows according To Light incident on LDR

Like this You can Test Many Components.