Boxed, ring stick + 63 individual finger sizers Dual magnification / multi magnification loupes This is the type used

This is the type used by dentists and surgeons

Most testers of this type are either for loose stones only

Power: 2 AAA batteries or USB

maybe 200X

Boxed, ring stick + 63 individual finger sizers Dual magnification / multi magnification loupes This is the type usedDetails Heavy duty ring stick for measuring rings: British A Z plus 6 extra large sizes Z+1 to Z+6. 63 individual rings for measuring fingers: British sizes A to Z, plus 6 extra large sizes Z+1 to Z+6. Includes half sizes (that's why there are so many rings). The width (not diameter) of each ring is 4mm. Posh fitted box includes clear labelling of sizes. Box measures 13" X 4" X 1"