1. Introduction
Thank you for choosing the Truper BASE-40 Electronic Price Computing Scale. This manual provides essential information for the safe and efficient operation of your new scale. Please read it thoroughly before use and retain it for future reference. This scale is designed for accurate weighing and price calculation of various items, with a maximum capacity of 40 kg.

Figure 1: Truper BASE-40 Electronic Price Computing Scale, showing the orange base, stainless steel weighing pan, and digital display with keypad.
2. Important Safety Information
To ensure safe operation and prolong the life of your scale, please observe the following precautions:
- Do not exceed the maximum weight capacity of 40 kg.
- Place the scale on a stable, level surface to ensure accurate readings.
- Avoid exposing the scale to extreme temperatures, direct sunlight, or high humidity.
- Keep the scale away from strong electromagnetic fields, which can interfere with its operation.
- Do not immerse the scale in water or other liquids. Clean with a damp cloth only.
- Do not attempt to disassemble or repair the scale yourself. Contact qualified service personnel for assistance.
- Ensure the power adapter is correctly connected and used with the specified voltage.
3. Package Contents
Upon unpacking, please verify that all the following items are included:
- Truper BASE-40 Electronic Price Computing Scale
- Stainless Steel Weighing Pan
- Power Adapter/Charger
- Rechargeable Battery (pre-installed or separate)
- User Manual (this document)

Figure 2: Front view of the Truper BASE-40 scale, highlighting the dual LCD displays for user and customer.
4. Product Overview and Components
Familiarize yourself with the different parts of your Truper BASE-40 scale:

Figure 3: Labeled diagram of the Truper BASE-40 Electronic Price Computing Scale components.
- Stainless Steel Weighing Pan: Measures 34 cm x 24 cm, designed for placing items to be weighed.
- Dual LCD Display (User/Customer): Shows weight, unit price, and total price. Features a backlight for visibility.
- AC Charge Indicator: Illuminates when the scale is connected to power and charging.
- Keypad with Humidity Protection: Used for entering prices, tare values, and accessing functions.
- Weight Unit Indicator (kg/lb): Shows the currently selected unit of weight.
- TARE Indicator: Illuminates when the tare function is active.
- ZERO Indicator: Illuminates when the scale is at zero weight.
- Level Indicator: A bubble level to ensure the scale is perfectly horizontal for accurate measurements.

Figure 4: Dimensions of the Truper BASE-40 scale. Height: 13 cm, Depth: 35 cm, Base Width: 34 cm. Weighing pan: 34 cm x 24 cm.
5. Setup
5.1 Unpacking
- Carefully remove all components from the packaging.
- Place the stainless steel weighing pan securely on the scale base.
- Retain packaging materials for future transport or storage.
5.2 Power Connection
- Connect the power adapter to the scale's power input port.
- Plug the adapter into a suitable electrical outlet.
- The scale features a rechargeable battery. It is recommended to fully charge the battery before first use (approximately 8-10 hours). The AC charge indicator will illuminate during charging.
5.3 Leveling the Scale
- Place the scale on a firm, flat, and stable surface.
- Adjust the leveling feet located at the bottom of the scale until the bubble in the level indicator (refer to Figure 3) is centered. This ensures accurate weighing.
6. Operating Instructions
The keypad provides various functions for weighing and price computing:

Figure 5: Keypad layout and function descriptions for the Truper BASE-40 scale.
6.1 Power On/Off
- Press the red power button (usually located on the front or side) to turn the scale ON or OFF.
6.2 Basic Weighing
- Ensure the scale is powered on and displays '0.000' in the weight window. If not, press the CERO (ZERO) button.
- Place the item to be weighed directly onto the stainless steel pan.
- The weight will be displayed in the 'PESO (kg)' window.
6.3 Tare Function
The TARE function allows you to subtract the weight of a container, so only the net weight of the contents is measured.
- Place the empty container on the weighing pan.
- Press the TARA (TARE) button. The display will reset to '0.000', and the TARE indicator will light up.
- Add the items to be weighed into the container. The display will show the net weight of the items.
- To clear the tare, remove the container and press TARA again.
6.4 Price Computing
- Place the item on the weighing pan.
- Using the numeric keypad (0-9), enter the unit price (e.g., price per kg) into the 'PRECIO UNITARIO ($/kg)' window.
- The 'TOTAL ($)' window will automatically display the calculated total price based on the weight and unit price.
6.5 Counting Function (SMP / CTN)
This function allows you to count the number of pieces based on a sample weight.
- Place a known number of sample pieces (e.g., 10, 20, 50) on the pan.
- Press the SMP button.
- Enter the number of sample pieces you placed (e.g., '10') using the numeric keypad.
- Press CTN. The scale will now be in counting mode.
- Add more pieces to the pan, and the display will show the total count.
6.6 Memory Functions (M1-M4)
The scale has 4 direct access memory keys (M1, M2, M3, M4) to store frequently used unit prices.
To Store a Unit Price:
- Enter the desired unit price using the numeric keypad.
- Press and hold one of the memory keys (M1, M2, M3, or M4) until a confirmation sound or display change occurs.
To Recall a Unit Price:
- Simply press the desired memory key (M1, M2, M3, or M4). The stored unit price will appear in the 'PRECIO UNITARIO' window.
6.7 Backlight (LUZ)
- Press the LUZ button to turn the display backlight ON or OFF, improving visibility in different lighting conditions.
6.8 Unit Change (CMB kg/lb)
- Press the CMB kg/lb button to switch between kilograms (kg) and pounds (lb) as the unit of measurement.
6.9 Change Calculation (+)
- After a total price is displayed, press the + button.
- Enter the amount of money received from the customer using the numeric keypad.
- The display will show the change due to the customer.
7. Maintenance
7.1 Cleaning
- Always turn off and unplug the scale before cleaning.
- Wipe the scale surface and stainless steel pan with a soft, damp cloth.
- Do not use abrasive cleaners, solvents, or harsh chemicals, as these can damage the finish and electronic components.
- Ensure no liquid enters the display or keypad areas. The keypad has humidity protection, but excessive moisture should be avoided.
7.2 Battery Care
- To maximize battery life, avoid completely discharging the battery frequently.
- If the scale will not be used for an extended period, charge the battery periodically (e.g., every 3 months) to prevent deep discharge.
- Replace the battery if its performance significantly degrades. Use only compatible replacement batteries.
8. Troubleshooting
If you encounter issues with your scale, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Scale does not turn on | Low or dead battery; Power adapter not connected; Faulty power button. | Connect the power adapter and charge the battery. Ensure the power button is fully pressed. |
| Inaccurate readings | Scale not level; Unstable surface; Overload; Drafts or vibrations; Calibration needed. | Ensure the scale is level and on a stable surface. Avoid exceeding capacity. Operate in a stable environment. If issues persist, contact support for calibration guidance. |
| Display shows 'OVERLOAD' | Weight exceeds maximum capacity. | Remove the excess weight immediately to prevent damage. |
| Display is dim or flickering | Low battery; Backlight setting. | Charge the battery. Press the LUZ button to adjust backlight. |
| Keypad not responding | Moisture on keypad; Internal error. | Ensure keypad is dry. Try turning the scale off and on again. |
If the problem persists after trying these solutions, please contact Truper customer support.
9. Specifications
| Feature | Detail |
|---|---|
| Brand | Truper |
| Model Number | BASE-40 |
| Display Type | LCD with Backlight |
| Maximum Weight Capacity | 40 Kilograms |
| Readout Accuracy | 0.1 kilograms |
| Weigh Scale Type | Counter Scale |
| Material | Stainless Steel (Pan) |
| Item Weight | 2.8 Kilograms (6.16 pounds) |
| Product Dimensions | 12.99 x 14.57 x 4.33 inches (33 x 37 x 11 cm) |
| Power Source | Rechargeable Battery (included) / AC Adapter |
| Battery Life (approx.) | 150 hours of use (as per packaging) |
10. Warranty and Support
10.1 Warranty Information
The Truper BASE-40 Electronic Price Computing Scale typically comes with a 1-year manufacturer's warranty from the date of purchase, covering defects in materials and workmanship. Please refer to your purchase documentation or contact Truper customer service for specific warranty terms and conditions.
10.2 Customer Support
For technical assistance, warranty claims, or any questions regarding your Truper BASE-40 scale, please contact Truper customer support through their official website or the contact information provided with your product packaging.