Requires none power sources or charging, ensuring sages with 0 energy costs for measurements Encourages parent child interaction through simple measuring activities, introducing kids to basic science concepts while creating educational fun at home Features large printed fonts and distinct markings for effortless reading even in low light conditions, making it accessible for elderly users The 12cm baby pregnancy wheel wall mounted measurement chart provides data tracking for both baby and mother ' s weight changes, offering an efficient solution for home use by expecting parents This compact wheel is easy to mount on wall without rust concerns, maintaining cleanliness while being portable for indoor use, Manufacturer: EXQIOUR