Features：
1. Rotation design allow shift the used parts away and
hincrease use life of the model
2. Equipped with a plastic base to increase the stability
3. Intradermal injection:
① The needle can be inserted at an Angle of 5°
② Correct operation will have a real reaction,similar to
negative result in skin test
① Allow repeating practice
4. Intradermal injection and subcutaneous injection