THINKSCALE TK-PS4O
THINKSCALE Shipping Scale TK-PS4O User Manual
Model: TK-PS4O
Introduction
Thank you for choosing the THINKSCALE Digital Shipping Scale. This manual provides essential information for the safe and efficient operation of your scale. Please read it thoroughly before use and retain it for future reference. This scale is designed for accurate weighing of packages, parcels, mail, luggage, and other items up to 440 lbs (200 kg).
Important Safety Information
- Always place the scale on a hard, flat, and stable surface to ensure accurate readings.
- Do not overload the scale beyond its maximum capacity of 440 lbs (200 kg). Overloading can damage the scale.
- Avoid dropping the scale or subjecting it to strong impacts.
- Keep the scale away from water and extreme temperatures.
- Do not attempt to disassemble or repair the scale yourself. Contact customer support for assistance.
- Ensure proper battery installation and disposal according to local regulations.
Package Contents
Verify that all items are present in the package:
- THINKSCALE Digital Shipping Scale (Platform)
- LCD Display Unit with coiled cable
- USB Power Adapter
- USB Cable
- 2 x AAA Batteries
- Wall mounting screws and anchors (for display unit)
- User Manual (this document)

Image: The THINKSCALE shipping scale platform, separate LCD display unit, USB power adapter, USB cable, and two AAA batteries, as included in the package.
Setup
1. Powering the Scale
Your THINKSCALE shipping scale offers dual power options:
- USB Power Adapter: Connect the provided USB cable to the scale's display unit and then to the USB power adapter. Plug the adapter into a standard electrical outlet for continuous power.
- Batteries: Open the battery compartment on the back of the display unit. Insert the 2 AAA batteries, ensuring correct polarity (+/-). The scale can operate on batteries for full portability.

Image: The separate backlit display unit connected via a retractable cable, illustrating both AC adapter and AAA battery power options. A child stands on the scale platform, demonstrating the display's flexibility.
2. Scale Placement
For accurate measurements, place the scale platform on a firm, level, and stable surface. Uneven surfaces can lead to inaccurate readings.

Image: A close-up view of the underside of the scale platform, highlighting the anti-skid pads designed for secure and stable weighing.
3. Display Unit Placement
The separate backlit LCD display unit is connected by a coiled cable, allowing flexible placement. You can:
- Place it on a desk or countertop.
- Mount it on a wall using the provided screws and anchors. The display unit has a back nail slot for this purpose.
The display is designed to remain on and does not auto-shut off, ensuring continuous visibility of measurements.
Operating Instructions
1. Power On/Off
Press the POWER button (
) on the display unit to turn the scale on or off. The scale is pre-calibrated and ready for immediate use.
2. Unit Conversion
To switch between weighing units (kilograms, pounds, or pounds:ounces), press the MODE button. The display will cycle through kg, lb, and lb:oz.

Image: The scale's display unit illustrating the different weight units (kg, lb, lb:oz) that can be selected using the MODE button.
3. Tare Function
The Tare function allows you to zero out the weight of a container, so you only measure the contents.
- Place an empty container on the scale platform.
- Press the TARE button. The display will reset to 0.00.
- Add the items you wish to weigh into the container. The display will show the net weight of the items.

Image: A step-by-step visual guide demonstrating the Tare function, showing an empty box on the scale, the display zeroing out, and then the net weight of items placed inside the box.
4. Hold Function
The Hold function locks the weight on the display, which is useful when a large item obstructs the view of the display unit.
- Place the item on the scale.
- Once the weight stabilizes, press the HOLD button. The weight reading will be locked on the display.
- You can now remove the item, and the weight will remain visible on the screen for accurate recording.

Image: A visual representation of the Hold function, showing a package being weighed, the HOLD button being pressed, and the weight remaining on the display even after the package is removed.
5. Weighing Items
To weigh an item:
- Ensure the scale is on and displaying 0.00. If not, press TARE to zero it.
- Gently place the item to be weighed in the center of the scale platform.
- Wait for the display to stabilize and read the weight.

Image: The THINKSCALE shipping scale with a large cardboard box placed on its platform, and the separate display unit clearly showing the measured weight.
Maintenance
- Cleaning: Wipe the scale platform and display unit with a soft, damp cloth. Do not use abrasive cleaners or immerse the scale in water.
- Storage: Store the scale in a cool, dry place when not in use. If storing for an extended period, remove the batteries to prevent leakage.
- Calibration: The scale comes pre-calibrated. Routine user calibration is generally not required.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Display shows "LO" | Low battery power. | Replace the AAA batteries or connect the scale to USB power. |
| Display shows "ERR" | Scale is overloaded. | Remove the item from the scale. Ensure the item's weight does not exceed 440 lbs (200 kg). |
| Inaccurate readings | Scale not on a flat surface, item not centered, or external interference. | Place the scale on a hard, flat surface. Center the item on the platform. Avoid vibrations or drafts during weighing. |
| Scale does not turn on | No power or dead batteries. | Check battery installation and replace if necessary. Ensure USB power adapter is properly connected and functioning. |
Specifications
| Feature | Detail |
|---|---|
| Model Number | TK-PS4O |
| Weight Capacity | 440 lbs (200 kg) |
| Accuracy | 1 oz (10g) |
| Weighing Units | kg, lb, lb:oz |
| Display Type | Large Backlit LCD |
| Power Source | USB Power Adapter (included) or 2 x AAA Batteries (included) |
| Platform Material | Stainless Steel, Tempered Glass, ABS |
| Platform Dimensions | Approximately 12.73 x 11.18 inches |
| Retractable Cable Length | Approximately 47.2 inches |

Image: The THINKSCALE shipping scale platform with its dimensions (12.73 inches by 11.18 inches) and maximum capacity (200 kg / 440 lb) clearly indicated.
Warranty and Support
THINKSCALE provides the following support for your product:
- 2-Year Warranty: Your scale is covered by a 2-year warranty from the date of purchase.
- 30-Day Risk-Free Returns: If you are not satisfied with your purchase, you may return it within 30 days.
- For technical assistance, warranty claims, or product inquiries, please contact THINKSCALE customer support. Refer to your purchase documentation or the THINKSCALE website for contact details.
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