iUniker 5V 4A USB-C Power Supply for Raspberry Pi vs Kingwin Digital Power Supply Tester with LCD Screen
Updated August 2026 — iUniker 5V 4A USB-C Power Supply for Raspberry Pi wins on cable length and power output, Kingwin Digital Power Supply Tester with LCD Screen wins on display quality and safety features.
The iUniker power supply is a cost-effective and reliable option for Raspberry Pi users, while the Kingwin tester offers advanced diagnostic capabilities for PC enthusiasts. Depending on your needs, either product could be the better choice.
Why iUniker 5V 4A USB-C Power Supply for Raspberry Pi is better
Lower Price
iUniker is $9.99 compared to Kingwin's $16.99.
Built-in Switch
iUniker features a convenient ON/Off switch.
Targeted Use
iUniker is specifically designed for Raspberry Pi devices.
Why Kingwin Digital Power Supply Tester with LCD Screen is better
Diagnostic Features
Kingwin provides comprehensive power supply testing.
LCD Display
Kingwin has a clear LCD screen for real-time voltage readouts.
Multi-Compatibility
Kingwin supports a wide range of power supply types.
Overall score
Specifications
| Spec | iUniker 5V 4A USB-C Power Supply for Raspberry Pi | Kingwin Digital Power Supply Tester with LCD Screen |
|---|---|---|
| Power Type | USB-C | N/A |
| Max Output | 5V 4A | N/A |
| Display | N/A | LCD |
| Compatibility | Raspberry Pi 4 | Multi-PSU |
| Safety Features | UL Listed | Built-in safeguards |
Dimension comparison
Overview of the Products
In this comparison, we will look at the iUniker 5V 4A USB-C Power Supply for Raspberry Pi 4 and the Kingwin Digital Power Supply Tester with LCD Screen. The iUniker power supply is priced at $9.99, while the Kingwin tester is available for $16.99, making the iUniker about 41% cheaper. Each product serves a distinct purpose: the iUniker is designed to provide power to Raspberry Pi devices, while the Kingwin tester is a diagnostic tool for assessing the functionality of various power supply units.
Design and Build Quality
The iUniker power supply features a robust design with a built-in ON/Off switch, allowing for easy power management. It comes with a 5-foot cable, which adds flexibility in usage. In contrast, the Kingwin tester is made of high-quality aluminum, making it both lightweight and durable. Its compact design is user-friendly, appealing to both novices and seasoned technicians.
While the iUniker is specifically tailored for the Raspberry Pi 4 and other USB-C devices, the Kingwin tester's design focuses on versatility, accommodating multiple power supply types, including ATX, ITX, and more. The choice of materials in both products reflects their intended use—iUniker prioritizes functionality for power delivery, while Kingwin emphasizes portability and ease of use.
Features and Functionality
The iUniker power supply delivers stable power with a maximum output of 20W (5V 4A), ensuring that even under heavy loads, the Raspberry Pi operates smoothly. Its UL Listed certification guarantees safety features such as over-current and short-circuit protection.
On the other hand, the Kingwin tester offers a comprehensive diagnostic capability, allowing users to test a variety of power supply units. Its LCD screen provides real-time voltage readouts, giving precise measurements of multiple voltage rails. This feature is crucial for anyone looking to ensure that their components are receiving the appropriate power levels. Both products have unique features that cater to different needs—one aims to provide reliable power, while the other focuses on diagnostic accuracy.
Compatibility
The iUniker power supply is specifically compatible with the Raspberry Pi 4 and Orange Pi 5/5B, making it a targeted solution for users of these devices. It is not compatible with the newer Raspberry Pi 5, which requires higher power levels.
In contrast, the Kingwin tester is designed to work with a wide range of power supply types, including ATX, ITX, IDE, HDD, SATA, and BTX. This makes it a versatile tool for users who may work with various systems and need to ensure the reliability of different power supplies. When it comes to compatibility, the Kingwin tester has a clear advantage due to its adaptability across multiple platforms.
Ease of Use
The iUniker power supply features a convenient built-in ON/Off switch, which simplifies the process of powering the Raspberry Pi on and off without needing to unplug it. This can significantly enhance the lifespan of both the cable and the ports.
The Kingwin tester is designed for straightforward operation, with a plug-and-play interface that requires no advanced technical knowledge. This ease of use is particularly beneficial for beginners who may not be familiar with power supply diagnostics. Both products prioritize user convenience, but the iUniker leans more towards providing a practical power solution, while the Kingwin focuses on diagnostic simplicity.
Safety Features
Safety is paramount in power supply products, and both the iUniker and Kingwin incorporate essential safety features. The iUniker power supply is UL Listed, providing assurance of compliance with strict safety standards, including protection against over-voltage and short-circuits.
Similarly, the Kingwin tester includes built-in safeguards to protect against short circuits and overvoltage, ensuring a safe testing environment. Both products emphasize safety, but the iUniker’s UL certification offers an additional layer of credibility regarding its safety standards.
Price Comparison
The iUniker power supply is priced at $9.99, making it a budget-friendly option for those needing a reliable power source for their Raspberry Pi devices. In comparison, the Kingwin tester costs $16.99, which is about 41% more expensive than the iUniker. This price difference may influence purchasing decisions, especially for users who are primarily looking for a straightforward power supply rather than a diagnostic tool.
While the Kingwin tester offers advanced diagnostic capabilities, users must weigh whether these features justify the higher price. For those on a tighter budget or with specific needs, the iUniker might be the more appealing choice.
Which should you buy?
Ultimately, the decision between the iUniker 5V 4A USB-C Power Supply for Raspberry Pi 4 and the Kingwin Digital Power Supply Tester with LCD Screen hinges on your specific needs. If you are a Raspberry Pi user looking for a reliable and cost-effective power supply, the iUniker is an excellent choice, especially with its built-in switch and safety certifications.
Conversely, if you are a PC enthusiast or technician in need of a versatile diagnostic tool for various power supplies, the Kingwin tester would be more beneficial despite its higher price. Assess your requirements carefully to determine which product aligns best with your needs.

