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Environmentally friendly cobalt-free humidity indicator card, indicating range 10%～60%.
When the humidity in the environment around the humidity indicator card rises to a certain value, the corresponding indicator point on the indicator card will change from brown to light blue.
When the indicator point becomes gray (between brown and light blue), the value in the indicator point is the current ambient humidity.
The vacuum bag cannot be vacuumed or air leakage occurs after vacuum
The bag is not completely sealed
Open the zipper of the bag and reseal the zipper with the sealing clip to ensure that the zipper is completely closed
The air valve is not placed on a flat surface when pumping air
Re-lay the bag air valve
The suction port of the hand pump is not in full contact with the air valve
Make sure that the suction port is placed flat above the air valve with proper pressure
Excessive pressure on the air valve from the suction port
Adjust the pressing force of the hand pump
The air valve is not completely closed
Press the air valve with your fingers after vacuuming
The vacuum bag is damaged
Replace the vacuum bag
Manual pumping is slow
You can squeeze out a part of the air before pumping,the electric pumping device will be introduced later