Product Overview
The Ozeri WeightMaster 440 lbs Body Weight Scale is designed to provide a comprehensive yet simple solution for tracking and managing your weight. This advanced scale offers precise measurements, intelligent features, and user-friendly feedback to support your health journey.

Image: Top-down view of the Ozeri WeightMaster 440 lbs Body Weight Scale, showcasing its sleek black tempered glass surface and central digital display.
Key Features:
- BMI & BMR with 50 gram Weight Change Detection: Instantly displays your Body Mass Index (BMI), Basal Metabolic Rate (BMR), and net weight changes for a comprehensive understanding of your weight.
- Accurate Weight Tracking with 7 Day Memory: Measures weight to the nearest 50 grams (0.1 lbs / 0.05 kg) and allows you to see how your current weight changes from the previous day, the average of your last 3 days, and the previous week.
- Smart LCD with Color Alert Technology: Provides visual feedback with a GREEN illumination for weight loss and RED for weight gain, allowing focus on weight trends.
- Immediate and Flawless Results: Performs and displays all calculations directly on the scale's LCD, eliminating the need for complicated syncing or data connection.
- Quality Glass Construction with Built-in Intelligence: Made from impact-resistant tempered glass with non-slip, scratch-resistant feet. Features auto-recognition technology for up to 5 unique users, auto-calibration, and auto-shutoff.
Setup and Initial Use
Battery Installation:
The Ozeri WeightMaster scale requires 3 AAA batteries, which are included with your purchase. Locate the battery compartment on the underside of the scale. Insert the batteries, ensuring correct polarity (+/-) as indicated within the compartment. Close the battery cover securely.
Placement:
For accurate readings, place the scale on a hard, flat, and stable surface. Avoid carpets or uneven flooring, as this can affect measurement precision.
Initial Calibration (StepOn Technology):
The scale features 'StepOn' technology for automatic calibration. Simply step onto the scale to activate it. The display will show '0.0' or 'CAL' briefly before displaying your weight. For the most accurate first reading, it is recommended to step on the scale, allow it to display a reading, then step off. Wait for the display to clear, and then step on again for your actual measurement.
Setting Up User Profiles (Up to 5 Users):
The Ozeri WeightMaster can store profiles for up to 5 unique users, allowing for personalized tracking of BMI and BMR. Refer to the detailed instructions in the included physical manual for specific steps on how to input user data such as height and age. Once set up, the scale's Auto Recognition Technology will identify the user based on their weight, providing personalized data.
Operating Instructions
Taking a Measurement:
- Ensure the scale is on a firm, flat surface.
- Step onto the scale with bare feet, standing still and centered.
- The scale will automatically turn on and display your weight.
- After displaying your weight, it will cycle through your BMI, BMR, and weight change detection (L1, L3, L7) if a user profile is active.
- The scale will automatically power off after a few seconds of inactivity to conserve battery life.
Understanding the Display:
The LCD provides various metrics to help you monitor your progress:
- Weight: Your current body weight in pounds (lbs) or kilograms (kg).
- BMI (Body Mass Index): An estimate of body fat based on your height and weight.
- BMR (Basal Metabolic Rate): The number of calories your body needs to maintain basic physiological functions at rest.
- Weight Change Detection (L1, L3, L7): Displays your net weight change from your last weigh-in (L1), the average of your last 3 weigh-ins (L3), and the average of your last 7 weigh-ins (L7).
Color Alert Technology:
The scale's display illuminates in different colors to provide intuitive feedback on your weight trend:
- GREEN Illumination: Indicates weight loss.
- RED Illumination: Indicates weight gain.

Image: The scale's display showing two states: one with a red background indicating weight gain (169.2 lbs, L3 up 2.6), and another with a green background indicating weight loss (165.8 lbs, L7 down 0.8).
Maintenance
Cleaning:
The scale's tempered glass surface is easy to clean. Use a soft, damp cloth to wipe down the surface. Avoid abrasive cleaners or harsh chemicals, as these may damage the finish or electronic components. Ensure the scale is dry before storage or next use.
Battery Replacement:
When the display indicates low battery (often a 'Lo' symbol or dimming display), it's time to replace the batteries. Follow the battery installation steps outlined in the 'Setup' section. Always replace all 3 AAA batteries at the same time with new ones to ensure optimal performance.
Storage:
Store the scale in a cool, dry place away from direct sunlight and extreme temperatures. Do not place heavy objects on the scale when not in use, as this may affect its calibration over time.
Troubleshooting
If you encounter issues with your Ozeri WeightMaster scale, please refer to the following common solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No display / Scale won't turn on | Dead or incorrectly installed batteries. | Check battery polarity. Replace all 3 AAA batteries with new ones. |
| Inaccurate or inconsistent readings | Scale on uneven surface; Movement during measurement; Initial calibration issue; Low battery. | Ensure scale is on a hard, flat, level surface. Stand still and centered during measurement. Step off, wait for display to clear, then step on again. Replace batteries if low. |
| Display shows "Lo" | Low battery power. | Replace all 3 AAA batteries. |
| Display shows "Err" or overload message | Weight exceeds maximum capacity (440 lbs / 200 kg). | Ensure weight is within the scale's capacity. Step off the scale. |
| User profile not recognized | Significant weight change; Multiple users with similar weights. | Ensure your profile data (height, age) is correctly entered. If multiple users have very similar weights, the scale may prompt for manual user selection (refer to physical manual). |
Specifications
| Feature | Detail |
|---|---|
| Model Number | ZB21-B2 |
| Product Dimensions | 12.2 x 11.8 x 0.9 inches |
| Product Weight | 3.32 Pounds |
| Weight Capacity | Up to 440 lbs (200 kg) |
| Graduation | 50 grams (0.1 lbs / 0.05 kg) |
| Power Source | 3 AAA batteries (included) |
| Display Type | LCD |
| Special Features | Auto Shut Off, Basal Metabolic Rate (BMR), Body Mass Index (BMI), Bodyweight, Color Alert Technology, Auto Recognition for 5 users |
| Material | Impact-resistant tempered glass |
Warranty and Support
The Ozeri WeightMaster scale is backed by a manufacturer's warranty. For specific details regarding warranty coverage, terms, and conditions, please refer to the warranty information provided in the packaging or contact Ozeri customer support directly.
Customer Support:
For technical assistance, troubleshooting not covered in this manual, or warranty claims, please visit the official Ozeri Store or contact their customer service department. Contact information can typically be found on the Ozeri website or within the product packaging.
You can visit the Ozeri Store online for more information and support: Ozeri Store
