Math Roller Stamp Smart Stamps for Math Problems Roller Digital Teaching Stamp Math Stamp Roller Math Practice Question Maker

Math Roller Stamp Smart Stamps for Math Problems Roller Digital Teaching Stamp Math Stamp Roller Math Practice Question Maker
addition, subtraction, multiplication and division
1. Open the oil cap
2. The oil nozzle is aligned with the oil hole and 5.6 drops can be dropped
3. Add the oil cap and cover it