It is a failure diagnosis machine of the gasoline engine ignition system.
When the ignition pulse is received, the blue LED lights up, so you can check the 
presence or absence of electricity supply just by bringing it close to the spark plug cord.

Item description:
Brand: OPPAMA                                                    
Item Name: Ignition Indicator
Part Number: PET-4100
Size:
Detection distance (mm): 150
Width (mm): 68
Depth (mm): 6
Height (mm): 25
Measurement method: Pulse detection
Battery life about 3 years 
(from the time of shipment from the manufacturer)
Weight: 15g
Other Details:

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