Study circuits and electrical conductivity by building your own conductivity tester with the Miniature Bulb Basic Experiment Kit. The clasps attach to the battery holder or may be disconnected. The clasps can also be made into a simple switch. Uses 1 D battery (not included). Suggested ages 8 - 13. 

Dimensions: 
121 x 121 x 21 mm 

Requires 1 size D general purpose (zinc-carbon) battery (sold separately).

Included in the set: 
Battery box (with clasp and terminal) - 1 set 
Miniature bulb and socket - 1 set 
Miniature bulb holder - 1 
Switch kit (Testers A, B, clasp, and terminal) - 1 set 
Plastic conductive wire (300mm) - 1 
Wire connection cap - 2 
Aluminum foil (40-50mm) - 1 
Recording paper - 1

Warning: Small parts are a choking hazard for children 3 years old and younger. Adult supervision is required.