| HS Code | Official Doc | Tariff Rate | Origin | Destination | Effective Date |
|---|---|---|---|---|---|
| 9025801000 | Doc | 56.7% | CN | US | 2025-05-12 |
| 9025900600 | Doc | 55.0% | CN | US | 2025-05-12 |
| 9030100000 | Doc | 55.0% | CN | US | 2025-05-12 |
| 9030908400 | Doc | 55.0% | CN | US | 2025-05-12 |
| 8505110010 | Doc | 32.1% | CN | US | 2025-05-12 |
| 8505110090 | Doc | 32.1% | CN | US | 2025-05-12 |
| 8543708000 | Doc | 55.0% | CN | US | 2025-05-12 |
| 8543906800 | Doc | 55.0% | CN | US | 2025-05-12 |
Electroscope
An electroscope is an early scientific instrument used to detect the presence and magnitude of static electric charge. It functions by detecting an attraction or repulsion between charged objects.
Material:
Historically, electroscopes have been constructed from various materials. Common components include:
- Metal rod: Typically brass or aluminum, serving as the conductive pathway for charge.
- Metal leaves: Thin, flexible strips of metal foil (gold, silver, or aluminum are frequently used due to their ease of movement and reflectivity).
- Insulating support: Materials like glass, amber, or plastic to isolate the metal rod and leaves.
- Enclosing container: Often glass, to protect the leaves from air currents and maintain a stable environment.
Purpose:
The primary purpose of an electroscope is to qualitatively indicate the presence of electric charge. It does not measure the quantity of charge, but rather shows if charge is present and can indicate relative charge (positive or negative, though not always directly). It was instrumental in early investigations of electrical phenomena.
Function:
The electroscope operates on the principle of electrostatic repulsion.
- When a charged object is brought near the electroscope’s metal knob, electrons are either attracted to or repelled from the electroscope.
- This causes a separation of charge within the electroscope. Like charges accumulate at the leaves.
- Because like charges repel, the leaves diverge (spread apart). The degree of divergence indicates the relative amount of charge present.
- If the object is removed, the leaves slowly return to their original position if the electroscope is properly grounded.
Usage Scenarios:
- Demonstrating static electricity: Used in physics education to show the effects of charging objects by friction (e.g., rubbing a glass rod with silk).
- Detecting charge on objects: Determining if an object has a static charge, such as after being rubbed or exposed to an electrical source.
- Early experiments in electrostatics: Historically vital for experiments related to electrical induction, conduction, and the nature of electric charge.
- Determining the sign of charge (with grounding): By grounding the electroscope while a charged object is near, and then removing the ground, the sign of the charge on the object can be inferred based on whether the leaves diverge or converge.
Common Types:
- Pistol-grip electroscope: A common design with a handle for holding and a metal knob for charging.
- Vertical electroscope: Features a vertical metal rod with leaves at the top, often enclosed in a glass jar.
- Gold-leaf electroscope: Utilizes thin gold leaves, prized for their reflectivity and sensitivity.
- Quadrant electroscope: An older design with a quadrant-shaped metal sector.
- Volta’s electrophorus: Though not strictly an electroscope, it uses similar principles of induction to generate static charge and can be used in conjunction with an electroscope.
An electroscope is a scientific instrument used to detect the presence and magnitude of electric charge. It functions by detecting the repulsion between similarly charged objects.
Based on the provided reference material, the following HS codes may be relevant:
- 9025801000: This code covers hydrometers and similar floating instruments, thermometers, pyrometers, barometers, hygrometers and psychrometers, recording or not, and any combination of these instruments; parts and accessories thereof: Other instruments. While not a direct match, an electroscope could be classified here if considered a measuring instrument. The total tax rate is 56.7% (Base tariff: 1.7%, Additional tariff: 25.0%, Post-April 2, 2025, additional tariff: 30%).
- 9025900600: This code covers parts and accessories for the instruments listed in 9025. If the electroscope is being imported as a component or for repair/maintenance, this code may apply. The total tax rate is 55.0% (Base tariff: 0.0%, Additional tariff: 25.0%, Post-April 2, 2025, additional tariff: 30%).
- 8543708000: This code covers other machines and apparatus, specifically microwave amplifiers. While an electroscope is not a microwave amplifier, if it incorporates electronic components for signal processing or amplification, this code might be considered. The total tax rate is 55.0% (Base tariff: 0.0%, Additional tariff: 25.0%, Post-April 2, 2025, additional tariff: 30%).
Important Note: The classification of an electroscope is not explicitly defined within the provided reference material. The above codes are potential matches based on function and componentry. It is recommended to consult with a customs expert for a definitive classification.
According to the provided reference material, the HS code options related to 'electroscope' are limited, with only the following 3 found.