Introduction
The Calculated Industries Measure Master Pro 4020 is a professional-grade dimensional calculator designed for woodworkers, DIY enthusiasts, hobbyists, and craftsmen. It simplifies complex calculations involving feet, inches, and fractions, eliminating common errors associated with manual calculations or standard calculators. This manual provides comprehensive instructions for setting up, operating, and maintaining your Measure Master Pro 4020.

Figure 1: The Measure Master Pro 4020 calculator. This device is designed to perform dimensional math and conversions, displaying measurements in feet, inches, and fractions.
Key Features
- Dimensional Math & Conversions: Works and converts in all dimensional formats including feet-inches-fractions, decimal feet, decimal inches, inches, fractions, yards, meters, centimeters, millimeters, and board feet.
- Fractional Calculations: Handles all fractions (1/2's, 1/4's, 1/8's, 1/16's, 1/32's, 1/64's) with customizable fraction denominators for desired accuracy.
- Area & Volume Solutions: Calculates areas and volumes for various shapes.
- Circle Solutions: Instantly calculates circumference, circle area, and arc lengths using the dedicated "Circle" key.
- Material Estimation: Assists with material estimation for projects.
- Weight-per-Volume Key: Converts between weights (lbs, tons, kg) and finds weights of any material (tons per cubic yard, lbs per cubic foot, etc.).
- "Paperless" Tape: Allows review of the last 20 entries for verification.
- Standard Math Calculator: Functions as a regular math calculator for everyday needs.
Setup
Battery Installation
The Measure Master Pro 4020 is powered by a long-life battery. To install or replace the battery:
- Locate the battery compartment cover on the back of the unit.
- Use a small screwdriver or coin to open the compartment.
- Insert the new battery, ensuring correct polarity (+/-).
- Replace the compartment cover securely.
Note: Always use the recommended battery type to ensure optimal performance and battery life.
Operating Instructions
Basic Operations and Dimensional Entry
The Measure Master Pro 4020 features intuitively labeled dimensional unit keys. To enter a measurement, simply input the numerical value followed by the corresponding unit key (e.g., Feet, Inch, Fraction).
- Feet-Inch-Fraction Entry: Enter feet, press Feet, enter inches, press Inch, enter numerator, press /, enter denominator, press Fraction.
- Conversions: After entering a value, press the Conv key followed by the desired unit key (e.g., m for meters, cm for centimeters).
Fractions and Accuracy
The calculator allows you to work with various fraction denominators. You can set the fraction denominator to display your desired accuracy (from nearest 1/2 to 1/64) using the Custom Fraction Setting feature. Refer to the included User's Guide for detailed instructions on adjusting this setting.
Specialized Functions
- Weight-per-Volume: Use the dedicated Weight-per-Volume key to convert between weights (lbs, tons, kg) and calculate material weights based on density.
- Circle Solutions: Press the Circ key to access functions for calculating circumference, circle area, and arc lengths.
- "Paperless" Tape: To review your last 20 entries, utilize the "Paperless" Tape function. This allows you to scroll through previous calculations for verification or recall.
Maintenance
To ensure the longevity and optimal performance of your Measure Master Pro 4020, follow these maintenance guidelines:
- Cleaning: Wipe the calculator with a soft, dry cloth. Do not use abrasive cleaners or solvents, as they may damage the display or casing.
- Storage: Store the calculator in a cool, dry place, away from direct sunlight and extreme temperatures. The product includes a protective case for safe storage.
- Battery Care: If the calculator will not be used for an extended period, remove the battery to prevent leakage.
Troubleshooting
If you encounter issues with your Measure Master Pro 4020, consider the following common solutions:
- Calculator Not Turning On: Check the battery. Ensure it is correctly installed and has sufficient charge. Replace if necessary.
- Incorrect Calculations: Verify your input. Ensure you are using the correct dimensional unit keys and following the proper sequence for operations. Refer to the "Operating Instructions" section or the full User's Guide.
- Display Issues: If the display is dim or erratic, the battery may be low. Replace the battery.
For more complex issues, please refer to the comprehensive User's Guide or contact Calculated Industries customer support.
Specifications
| Attribute | Value |
|---|---|
| Model Name | 4020 |
| Item Model Number | cal4015 |
| Brand | Calculated Industries |
| Calculator Type | Professional Measurement |
| Power Source | Battery Powered |
| Display Type | LCD |
| Item Weight | 7.4 ounces |
| Package Dimensions | 8.62 x 5.91 x 1.34 inches |
| ASIN | B000Y9Y1KM |
| Date First Available | August 16, 2012 |
Warranty and Support
The Calculated Industries Measure Master Pro 4020 comes with a Full One-Year Manufacturer's Limited Warranty. For warranty claims, technical support, or additional information, please contact Calculated Industries directly.
You can visit the official Calculated Industries store for more products and support resources: Calculated Industries Store.

