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

Using TESTERA:

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 Gets off when tilted upside Down

LDR                                                                              LED Glows according To Light(More the lIght                                                                                                    more LED Glows) 

Like this You can Test Many Components.