solar power calculator,20cm ruler,solar power,eco-friendly, real power calculation,stationery calculator,gift calcualtor Description:solar power calculator with rulerABS body, ruler scientific calculator solar power calculator,20cm ruler,solar power,eco-friendly,real power calculation,stationery calculator,gift calcualtorDetails:unit size: 20.9*5.1*0.7CM Battery:AG10*1pc(included)packing:white ...