So you've got a project on the bench — maybe a custom lithium battery pack for a solar setup, a microcontroller prototype, or a handheld gaming device you want to protect on the go. The question most people hit quickly is: what supporting tools do I actually need, and what do they do? This guide covers four practical electronics accessories worth understanding before you buy.
Know What Your Chargers and Cables Are Really Doing
One of the most overlooked tools in any electronics kit is a USB power tester. USB power delivery testers are one of the quickest and easiest ways to diagnose and troubleshoot USB ports and USB chargers. In practical terms, you plug one inline between a charger (or power bank) and your device, and it gives you a live readout of voltage, current, and power draw. You plug it between your power source and the device to be measured, and it passes all current and data signals through while showing current and voltage readings.
This matters more than most people realize. A charger that claims to support fast charging may not actually be delivering the right voltage under load. A tester can detect the wattage a charger claims to support and check that voltage levels remain within specification under high load. The USB Type-C PD USB Tester 8A Digital Voltage Current Capacity Meter ($35.20) handles up to 8A and supports QC3.0 fast-charge protocols, with an optional Bluetooth version if you want to log data over time. It's a particularly handy tool if you're regularly working with power banks, multi-port chargers, or Type-C cables of uncertain quality.
A Bench Power Supply for Prototyping and Repair
A bench power supply converts mains AC into adjustable, regulated DC output, so you can dial in the voltage a circuit needs and cap the current so a wiring mistake does not destroy the circuit. If you're testing sensors, running Arduino projects, or doing electronics repair, this is the tool that replaces a pile of batteries and guesswork.
The Adjustable AC to DC Power Supply Adapter 3–24V 3A 72W ($38.41) covers a wide voltage range — 3V to 24V — with a 3A current limit and 72W max output. It accepts both EU and US plug configurations, which is useful if you work across different regions. Adjustable power supplies like this are suitable for Arduino projects, laboratories, schools, electronic maintenance, electrolysis, lamp testing, aging tests, and DIY work. The alligator clip leads make it straightforward to connect directly to circuit boards or components without soldering.
Protecting Your Lithium Battery Pack
If you're building or maintaining a lithium battery pack — for an e-bike, solar storage, RV, or similar application — a battery management system (BMS) is not optional. In order to ensure the safety and efficient operation of lithium-ion battery systems, battery management systems are required.
The JK Smart BMS 4S–8S 12V/24V Battery Management System with 2A Active Balancer ($154.73) is one of the more capable options in this price range. It monitors parameters such as battery voltage, temperature, and current, and takes protective measures against overcharge, over-discharge, overcurrent, and overheating. The 2A active balancer is a meaningful differentiator from cheaper passive-balance units: the high-current active balancing technology can maximize battery consistency, improve battery range, and slow down battery aging. The heat function is particularly relevant if your pack lives somewhere cold — lithium batteries perform poorly in cold temperatures, and the built-in heating circuit warms the battery pack before allowing charge current. This unit has been a steady seller, which reflects how many people are building or upgrading their own battery systems right now.
Protecting Your Gear: The AYN Thor Case
Not every tool is about electricity. If you own an AYN Thor dual-screen handheld gaming device, keeping it protected during travel or storage is a real concern — the dual-screen form factor is more fragile than a standard handheld. The AYN Thor Handheld Protective Case/Storage Bag with Lanyard ($41.31) is a purpose-built soft pouch with a custom fit for this specific device, available in black, grey, and white. The included lanyard adds a carry option that generic pouches typically skip.
What to Buy First
- Just getting started with electronics? The adjustable DC power supply is foundational — it's the one tool that changes how you approach every wiring or repair project.
- Troubleshooting chargers or cables regularly? The USB power tester pays for itself quickly in time saved and cables avoided.
- Building a lithium pack? Don't skip the BMS. A smart unit with active balancing is worth the extra investment over a basic passive board.
- AYN Thor owner? A dedicated case is worth it if the device travels with you.
None of these are impulse buys — each one solves a specific problem. Understanding what problem you have first will tell you which one to reach for.