1. China Student exam calculator For sale tells you that you should avoid storing or using calculators in areas with high humidity and high dust. China Student exam calculator For sale tells you to be careful not to let the calculator be splashed with water, or exposed to high humidity and high dust environment. This condition can damage the internal circuitry.

2. China Student exam calculator For sale tells you please don't drop the calculator or let it be hit hard. 3. Please do not twist or bend the calculator. Please do not put the calculator in the pocket of your trousers or other tight clothing, because it may twist or bend the calculator. 4. Never disassemble the calculator.
5. China Student exam calculator For sale tells you not to use a ballpoint pen or other sharp objects to press the buttons of the calculator. 6. Clean the outside of the calculator with a soft, oscilloscope-cleaning, dry cloth. becomes dirty, wipe it with a soft cloth dampened with a solution of household cleaner and water.
China Student exam calculator For sale tells you to squeeze out excess water before wiping the calculator. Never use thinner, gasoline, or other volatile solvents to clean the calculator. This can erase the printed design and damage the calculator case.