Used Tablet and Headphone Inspection Guide: What to Check Before Buying

There are plenty of guides for inspecting used phones, but the inspection methods for used tablets and headphones are different. This guide covers the core checks you need to perform before placing an order or inspecting the item in person.

1. Used Tablet Inspection

Physical Inspection

Screen:

Check for bright spots or dark spots on a solid white background
Display full-screen red/green/blue solid colors to check color uniformity
Touch all four corners and edges to test touch sensitivity
Hold the screen up to light to check scratch depth

Back Panel and Frame:

Degree of denting or scuffing on the frame
Any bending on the back panel (the tablet feels warped when held)
Check if the hinge (for models with a keyboard) is loose or wobbly

Ports:

Charging port (USB-C or Lightning): check for wobbling when plugging/unplugging
Headphone jack (if present)
Memory card slot (if present)

Functional Testing

Battery Health:

iOS Tablets (iPad):

Settings → General → About → Check "Maximum Capacity"
Above 90%: Good
80-90%: Acceptable
Below 80%: May need a battery replacement

Android Tablets:

Some models allow checking battery info via dialing ##4636##
Or download an app like AccuBattery for testing
Or ask the seller to provide battery health information

Screen Burn-in (OLED screens):

Display a full white screen to check for uniformity (OLED screens can burn in from static images over time)
Display a classic gray pattern from a screen test app to check for ghosting

Camera:

Test both front and rear cameras by taking photos
Check autofocus speed and image clarity
Test video recording

Speakers:

Play audio and check each speaker driver (usually multiple)
Listen for distortion, crackling, or buzzing

Network Connectivity:

Test Wi-Fi connection
Cellular models: check if the SIM card slot is intact and test signal reception

iPad-Specific Checks

Activation Lock (Important!):

Ask the seller to sign out of their Apple ID in Settings
An iPad that hasn't been signed out of Apple ID is a high-risk item (could be stolen or locked)
Test method: Settings → [Seller's Name], confirm they are logged out, then perform a factory reset

Official Refurbished Status:

The iPad typically has an IMEI/serial number on the back
Check warranty status on Apple's official website (to confirm it's original, not a replacement unit)

2. Used Headphone Inspection

Physical Inspection

Headphone Body:

Check the earpiece mesh for blockages (earwax or debris)
Wired models: check for cracks or damage at cable bends
Charging case: check if the magnetic closure is secure and the hinge opens/closes smoothly

Wear and Tear:

Headband padding (leather): check the condition of genuine leather or pleather
Headband adjustment: check if it slides smoothly with proper resistance

Functional Testing

Left/Right Channels:

Play a dedicated left/right channel test audio
Confirm both channels produce sound individually, with no missing channels

Noise Cancellation (ANC headphones):

Enable noise cancellation and check its effectiveness
Disable noise cancellation and check for noticeable wind noise (microphone issue)

Call Microphone:

Make a phone call to confirm the other party can hear you clearly
Ambient microphones (for noise cancellation): test via system self-check during function testing

Bluetooth Connectivity:

Test connection stability (does it disconnect when moving around?)
Check connection range (stable at 5-10 meters away from the phone?)

Battery Life:

Ask the seller about usage time/purchase date
Bluetooth headphone batteries typically last about 300-500 full charge cycles
Headphones used for 2-3 years may have 30-50% reduced battery life
Test the actual battery life after a full charge (compare to official specs)

True Wireless (TWS) Specific Checks

Charging Case:

Place both earbuds in the charging case and confirm they snap into place magnetically
Charge the case and test if it charges the earbuds (5-minute charge test)

Connection Switching:

Test switching from phone A to phone B
Test using only the left or right earbud individually

In-Ear Detection:

After wearing, test if removing an earbud automatically pauses playback

Over-Ear Noise-Cancelling Specific Checks

Headband Durability:

Extend and retract the headband multiple times to check for loose clicks
Ensure the folding mechanism is flexible and makes no unusual noises

Ear Pad Condition:

PU leather ear pads typically start to crack and peel after 2-3 years
Cracked ear pads reduce seal quality, affecting bass and noise cancellation performance
Third-party replacement ear pads are available (usually around 100-200 RMB)

3. Tablet Price Reference Guide

Main Factors Affecting Used Price

Factor	Impact
Larger storage capacity	+ Price
Cellular model	+ Price
Official repair history (screen, battery)	Generally - Price
Third-party repair	- Price
Battery health > 90%	Maintains price
Box and accessories complete	+ Price

Purchase Channel Risk Levels

Channel	Risk	Advantage
Official certified refurbished (Apple official)	Low	Has warranty
Platform certified (major e-commerce platforms)	Low to Medium	Some protection
Second-hand platforms (e.g., Xianyu)	Medium	Lowest price
Offline second-hand stores	Low to Medium	Can inspect in person
Private seller (stranger)	High	Low price

4. Common Scams and How to Avoid Them

Common Tablet Scams

Activation Lock Device:

Apple ID not signed out at the time of purchase
Seller disappears and becomes unreachable
Device becomes unusable
How to avoid: Have the seller sign out of Apple ID in front of you, then perform a factory reset

Refurbished/Assembled Device:

Screen has been replaced (original vs. non-original screens differ significantly)
Use iPad-specific diagnostic tools (e.g., 3uTools) to check the screen serial number

Battery Health Fraud:

Some sellers fully charge the device before taking photos to show 100% charge, hiding battery issues
How to avoid: Check the battery health percentage in Settings, not the current charge level

Common Headphone Scams

Missing Accessories:

Original silicone ear tips in different sizes (full set)
Charging cable (iOS/USB-C)
Confirm all accessories are included before purchase

Counterfeit Products:

Some high-end headphones have many counterfeit versions
Verification: Check the serial number on the official website (most major brands support this)
Learn the distinguishing features of authentic vs. counterfeit for high-end models before buying

Refurbished Battery:

Headphone battery life is significantly reduced but the exterior looks new
How to avoid: Test actual battery life and compare to official specs

5. Negotiation Strategy

Reasonable Price Reduction Arguments

Points you can negotiate on:

Battery health below 90% (replacement cost)
Third-party repair history
Visible scratches (depreciation of consumable value)
No original accessories (value of accessories)
Purchase date over 2 years ago

Estimation Method:

Look up the current price of a new unit × used discount ratio
Then subtract: battery replacement cost + repair/accessory costs
Add personal negotiation room (10-15%)

6. Summary

Tablet Inspection Priorities:

Activation lock signed out (mandatory for iPad)
Battery health percentage
Screen uniformity (white screen test)
Charging/port stability

Headphone Inspection Priorities:

Left/right channel test
Actual battery life test
Noise cancellation function test
Charging case charging function
Connection stability

Purchase Advice:

For high-value items (flagship tablets, premium headphones), prioritize refurbished channels with warranty
For mid-range items, buy on second-hand platforms, inspect in person, or request a 7-day no-questions-asked return policy