With some chargers, no current is passed on, the display remains dark. What could be the reason?

The output and input of this USB tester should be connected at same time, so that the screen lights up. Make sure one end is connected to the charger and the other end is connected to the load.

Does the device save data (charged mah) after being unplugged?

Yes, this USB tester has auto save function when power off. The saved data can be read on the next connection.

What should I do if I receive a damaged product?

Our goods arrive at the Amazon warehouse after long-distance international transportation, and there is inevitably a certain defect rate. If you receive a damaged product, you can contact our customer service through Amazon, we will reply you within 24 hours and provide you with a satisfactory solution.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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YOJOCK USB C Tester Power Meter 4-30V 0-6.5A Voltage and Current Tester Meter, USB Capacity, Temperature, Working Time Ammeter Voltmeter Power Bank Charger Detector (Classic Version)

YOJOCK USB C Tester Power Meter 4-30V 0-6.5A Voltage and Current Tester Meter, USB Capacity, Temperature, Working Time Ammeter Voltmeter Power Bank Charger Detector (Classic Version)

Product ID: 469705512

Details

Brand
YOJOCK
Colour
Black
Min. Operating voltage
4 Volts
Power source
Corded
Style
Compact

⏳Power-off data storage

⚡4-30V voltage range

🔋0-6.5A current measurement

HK$167

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hong Kong.

Secure transaction

Description

⚡ Charge smarter, not harder — never miss a watt!

SMART DATA RETENTION - Power-off storage saves your charging stats for effortless tracking anytime.
USER FRIENDLY INTERFACE - One-button control cycles screens, rotates data, and resets with intuitive clicks.
TRUSTED BY TECH ENTHUSIASTS - Top choice for gamers & digital pros ensuring your gear charges optimally.
ACCURATE POWER METRICS ON THE GO - Measures voltage, current, capacity, temperature & working time with precision.
UNIVERSAL FAST CHARGING COMPATIBILITY - Supports QC2.0/3.0/4.0, Super VOOC & PD2.0/3.0 protocols for all your devices.

The YOJOCK USB C Tester Power Meter is a compact, professional-grade device designed to measure voltage (4-30V), current (0-6.5A), capacity, temperature, and working time for USB-C devices. It supports multiple fast charging protocols including QC and PD standards, stores data even when powered off, and features an easy-to-use button interface. Ideal for tech-savvy users and quality inspectors, it ensures precise monitoring of power banks, chargers, and USB peripherals.

Specifications

ASIN	B0B99Z2GJK
Best Sellers Rank	60,502 in DIY & Tools ( See Top 100 in DIY & Tools ) 119 in Voltage Testers
Brand	YOJOCK
Colour	Black
Compatible Devices	USB C Devices
Country Of Origin	China
Customer Reviews	4.4 4.4 out of 5 stars (1,211)
Included Components	USB C Tester
Manufacturer	YOJOCK
Manufacturer Part Number	KWS-066C
Maximum Operating Voltage	30 Volts
Measurement Type	Ammeter, Voltmeter
Minimum Operating Voltage	4 Volts
Model Number	YJ-TC01
Number of Items	1
Number of Packs	1
Power Source	Corded Electric
Specification Met	energy
Style Name	Compact
Unit Count	1.0 count

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

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Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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HK$167

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hong Kong.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

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