The 5-in-1 Outdoor Measure-Mate can be configured into many measurement tools including: vertical measure, callipers, trundle wheel, spirit level and measuring stick, ensuring children have all the tools needed to explore. 7-piece set includes two x calliper jaws, trundle wheel featuring bird "footprint" tread, handle/base, measuring stick showing centimeters and inches, sheet of colorful stickers, mesh storage bag and activity guide. Its robust build ensures it will cope with vigorous use in rough terrain and all components can be returned and stored in the included handy mesh bag. Ages 4 and up.