Application: Portable automatic cordless electric fish scaler with strong and powerful torque is widely used in fish markets, seafood markets, vegetable markets, hotels, restaurants, fish processing plants, and home kitchens. The electric fish scaler is easy to use and quickly removes fish scales in minutes, saving time and helping prepare fresh fish for family meals or customer service. Forward Rotation & Reverse Rotation: When installing the battery, aligning the "+" and "-" poles of the battery with the corresponding "+" and "-" poles on the scaler body results in clockwise rotation, suitable for right-handed users. Reversing the battery installation causes counterclockwise rotation, ideal for left-handed users. Extra Rechargeable Battery: The electric fish scaler comes with a rechargeable 16.8V 2000mAh lithium-ion battery. Charging time is 1-3 hours. After full charge, the device operates continuously for 2.5-3 hours in idle state. It can scale approximately 220 lbs of fish under normal conditions, around 187-198 lbs in cold weather, and about 231-243 lbs in hot weather. How to Use: The electric fish scaler features a push-button switch. Press and hold the switch to operate; release to stop. Wear cut-resistant gloves before use. Users can press the switch with either hand while holding the fish head with the opposite hand, scraping from the head toward the tail. Some practice may be needed to master efficient operation. Suitable Fish Scales: This electric fish scaler is designed for larger fish with harder scales. It works well on fish weighing between 1.1 and 8.8 lbs, such as mackerel, carp, grass carp, silver carp, black carp, and bighead carp. Adjust pressure according to scale hardness—use normal pressure for tough scales like those on mackerel and grass carp, and lighter pressure for softer scales like those on silver carp to avoid damaging the flesh.