Whats the name of the childrens activity book in the 80's-90's?

[xangeleyes]

When I was a child my mum used to buy these activity books for me. You had to buy this big thick grey pen type thing seperately in order to use these books.

Each book would have a series of questions inside such as 'How many red balls can you see', and you would put this pen nib (not a real pen with ink in) on the square next to the correct answer, and the pen would tell you if you were correct.

At the start of each book, you had to press the 'pen' nib on the first page to register on the pen what book it was.

You could buy them from places like tescos.

Can you help me please?
Any names, or pictures of it.

Thank you

[Heather74]

Questron

[xangeleyes]

THANK YOU

Seems I can't buy the wand though! Ah, where can I go? Ebay don't have any, amazon doesn't either. Loads of the books though, but they're a bit rubbish without the pen/wand lol.