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3V-30V Digital Multifunction USB Tester Mini Current Voltage Charger Capacity Detector USB Charger Doctor Power Bank Meter

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Digital Display USB multifunction tester 3V-30V Mini Current Voltage Charger Capacity Tester USB Doctor power bank meter
Performance parameters
1, input / output voltage: 3V-30V
2, the input / output current: 0A- 3A
3, the test capacity range: 0-99999 mA
4, accuracy: ¡À 1%
5, the test: voltage, current, discharge flow
6, the communication function:
7. Timing: YES
8. The over-current protection: Yes
Second, the use
Power display current and voltage, a single short press the button for about 0.5 seconds to view the capacity and timing screens. When displayed on the screen press capacity around button for two seconds to clear the stored data. When the display screen at the timing of the long press button for two seconds will be flashing numbers, and then press a single button for 0.5 seconds each time the cumulative 0.5 hours per block long press 2 seconds to confirm the save. To not adjusted to the timing of the timer function 0 hours (0 hours is normally open) phone is fully charged to automatically turn off the output. No load 20 seconds automatically shut down output. Current exceeds 3A will automatically shut down when the output voltage is higher than 22V. Close current output window displays OFF. Single short press the button for about 0.5 seconds to activate the output.

Three characteristics
The phone is fully charged to automatically turn off the output. No load 20 seconds automatically shut down output.
It displays the voltage and current data mAH, timing, easy viewing
It can detect mobile power output mAH

Power-down save function
USB and MicroUSB port male double take power, can be detected MicroUSB line quality
Current sampling 50 milliohms, smaller loss
With precision current calibration, higher current accuracy (calibrated okay shipped)

Measuring voltage and current:
USB male plug 5V chargers, mobile phones and other equipment female insert, read current and voltage directly
MicroUSB line quality measurement: female plug mobile phones and other devices, first use the native male plug 5V chargers, remember that voltage, then MicroUSB cable into the bore in mind that the machine MicroUSB charger voltage from 5V, the smaller the gap voltage MicroUSB cable quality is better

Battery capacity test:
Use TP4056 and other linear charging circuit through this capacity to the table completely empty battery is fully charged to full capacity reading on the battery capacity, the use of this method can be measured charge capacity of the phone, the phone can even calculate the charging efficiency
Mobile measuring power output capacity and efficiency:

The first machine connected mobile power, mobile power turn on, long press the button until the volume of data to zero, into the phone and more mobile power charging until no power automatically shut down. Next displayed when you turn the unit capacity is the mobile power output mAH. Note that this mAH than nominal mAH small output mAH * Output voltage 5V / battery mAH * Battery voltage 3.7V = mobile power efficiency


1 x usb tester


1. WORLDWIDE SHIPPING. (Except some countries and APO/FPO)
2. Orders processed timely after the payment verification.
3. We only ship to confirmed order addresses. Your order address MUST MATCH your Shipping address.
4. The images shown are not the actual item and are for your reference only.
5. SERVICE TRANSIT TIME is provided by the carrier and excludes weekends and holidays. Transit time may vary, particularly during the holiday season.
6. If you have not received your order after 30 days from payment, please contact us. We will trace your order and get back to you asap. Our goal is customer satisfaction!
7. Delivery Time:

1. You have 7 days to contact us and 30 days to return it from the date received. If the item is in your possession more than 7 days, it will be considered used and WE WILL NOT ISSUE A REFUND OR REPLACEMENT to you. There are NO EXCEPTIONS!
Shipping cost is bear by both seller and buyer in half.
2. All returned items MUST BE in the original packaging and you MUST PROVIDE us with the shipping tracking number, specific reason for the return, and your order ID.
3. We will refund YOUR FULL WINNING BID AMOUNT, upon receipt of the item in its original condition and packaging with all components and accessories included, AFTER BOTH Buyer and Seller cancel the transaction from . OR, you may choose to have a replacement.
4. We will bear all the shipping cost if the product(s) is (are) not as advertised.

1. 12 months Manufacturer¡¯s limited Warranty for defective items (excluding items damaged and/or misused after receipt). Accessories come with a 3-month warranty.
2. Defective items MUST BE reported and returned within the warranty period (and in the original packaging, if possible). You must tell us what the defect is and give us your order number. WE DO NOT REPAIR OR REPLACE ITEMS WITH AN
You agree to all of the above-listed policies upon ordering on !

We maintain high standards of excellence and strive for 100% customer satisfaction! Feedback is very important. We request that you contact us immediately BEFORE you give us neutral or negative feedback, so that we can perform up your satisfaction.
It is impossible to address issues if we do not know about them!




The total estimated time it takes to receive your order is shown below:
You place your order(Processing time)We ship your order(Shipping time)Delivery!Total Estimated Delivery Time
The total delivery time is calculated from the time your order is placed until the time it is delivered to you. Total delivery time is broken down into processing time and shipping time.
Processing time: The time it takes to prepare your item(s) to ship from our warehouse. This includes preparing your items, performing quality checks, and packing for shipment.
Shipping time: The time for your item(s) to travel from our warehouse to your destination.

Economic Airmail - (15-30 business days) Untracked
Registered Airmail - (15-20 business days) Tracked
Direct Line Delivery - (10-15 business days) Tracked
Express Delivery - (7-10 business days) Tracked

(1) The shipping time mentioned above refers to the estimated time of business days that the shipment will take after an order has been shipped.
(2) Business days do not include Saturday/Sunday and any public holidays.
(3) These estimates are based on normal circumstances and are not a guarantee of delivery times.
(4) We are not responsible for the failures or delays in delivery resulting from any force majeure event, such as natural disaster, bad weather, war, customs issues, and any other event beyond our direct control.
(5) Expedited shipping can not be used for PO Box addresses


Return policy

30 Days No Reason Return

If you are not satisfied with your purchase and the product is still in brand new condition, we can arrange a partial refund, which will cover the price of the item minus the shipping fees. You will be responsible for paying the return shipping fees.
Please contact us for Return Material Authorization within 30 days of the order being received.

Note:Items such as underwear / swimsuits are not covered by this guarantee due to hygiene considerations. If you need help, you can check the Apparel Return Process below, or contact us

90 Days up to the Quality of the Exchange or Refund

If there are quality problems in some categories of products, you can get a refund or exchange up to 90 days. You can contact us to learn if the product is in this category.

Note: Due to its nature and intended use, clothing, shoes, bracelets, decorations, phone and tablet accessories, household gadgets, home decorations, RC toys, home textiles, and other similar items are not included in this warranty period. For other product details please contact us or reference other warranties.

To complete your return, we require a receipt or proof of purchase.

Please do not send your purchase back to the manufacturer.

There are certain situations where only partial refunds are granted (if applicable)
Book with obvious signs of use
CD, DVD, VHS tape, software, video game, cassette tape, or vinyl record that has been opened
Any item not in its original condition, is damaged or missing parts for reasons not due to our error
Any item that is returned more than 30 days after delivery

Refunds (if applicable)
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.

Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at

Sale items (if applicable)
Only regular priced items may be refunded, unfortunately sale items cannot be refunded.

Exchanges (if applicable)
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at and send your item to us
If the item was marked as a gift when purchased and shipped directly to you, you’ll receive a gift credit for the value of your return. Once the returned item is received, a gift certificate will be mailed to you.

If the item wasn’t marked as a gift when purchased, or the gift giver had the order shipped to themselves to give to you later, we will send a refund to the gift giver and he will find out about your return.

To return your product, you should mail your product to us

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.

Depending on where you live, the time it may take for your exchanged product to reach you, may vary.

If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.

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3V-30V Digital Multifunction USB Tester Mini Current Voltage Charger Capacity Detector USB Charger Doctor Power Bank Meter
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