Could anybody identify this object?

[CAWORK]

Good Afternoon Everybody,

I was just helping someone clean out their shed and came across the following object.

It appears to be brand new/never used, neither of us could figure out what it is.

If anybody has any idea that would be great.

Regards.

 

[EddieM]

spark plug tester.

See here https://www.amazon.co.uk/Neiko-Tools-Line-Spark-Tester/dp/B000MHNDSM other outlets are available.

 

[Rodders53]

Spark tester - testing the HT cables/distributor not the plugs themselves - https://www.sealey.co.uk/product/5637206111/in-line-ignition-spark-tester