1. Introduction
The MARATHON BA030001 Vertical Outdoor Thermometer provides accurate temperature readings for both indoor and outdoor environments. Featuring a large, 16-inch (40 cm) display with easy-to-read numbers, this thermometer shows temperatures in both Celsius (°C) and Fahrenheit (°F). Its mercury-free design ensures it is non-toxic and environmentally safe. The weather-resistant construction makes it suitable for various climates, including snow and rain.
2. Product Features
- Large Display: 16-inch (40 cm) tall with extra-large numbers for easy readability from a distance.
- Dual Scale: Displays temperature in both Celsius (-40°C to 50°C) and Fahrenheit (-40°F to 120°F).
- Simple Operation: No buttons or complex settings; provides instant, accurate readings.
- Weather-Resistant: Durable construction designed to withstand various outdoor conditions.
- Easy Installation: Includes 2 mounting screws for quick and secure wall mounting.
- Mercury-Free: Environmentally safe and non-toxic.

3. Setup & Installation
The thermometer is designed for straightforward installation. Follow these steps for optimal placement and mounting:
- Choose a Location: Select a location that is out of direct sunlight for the most accurate temperature readings. Ideal spots include under the eaves of a house, a sheltered bird feeder, a covered patio porch, or any wooden instrument shelter. It can also be used indoors.
- Mounting: Use the two included mounting screws to secure the thermometer to a wall, fence, window sill, or other suitable surface. The thermometer features holes on both the top and bottom for versatile hanging options.


4. Operation
This thermometer is designed for simplicity. No batteries or complex setup are required. The liquid column inside the thermometer will rise and fall with ambient temperature changes, providing an immediate reading on both the Celsius and Fahrenheit scales. Simply observe the level of the red liquid to determine the current temperature.
The temperature range displayed is from -40°C (-40°F) to 50°C (120°F).
5. Maintenance
The MARATHON BA030001 thermometer requires minimal maintenance:
- Cleaning: Wipe the thermometer clean with a soft, damp cloth as needed. Avoid using harsh chemicals or abrasive cleaners, which could damage the display or casing.
- Placement: Periodically check that the thermometer remains securely mounted and is not exposed to direct sunlight for prolonged periods, which can affect accuracy.
6. Troubleshooting
If you encounter issues with your thermometer, consider the following:
- Inaccurate Readings: Ensure the thermometer is not in direct sunlight. Direct sunlight can cause the thermometer to read higher than the actual ambient air temperature. Relocate it to a shaded area.
- Difficulty Reading: This type of thermometer may have a narrow viewing angle. For best readability, view the thermometer directly from the front.
- Liquid Column Separation: In rare cases, the liquid column may separate during transit or due to extreme temperature fluctuations. Gently tap the thermometer against your palm a few times to try and reunite the liquid. If the issue persists, contact customer support.
7. Specifications
- Model:
- BA030001
- Brand:
- MARATHON
- Dimensions:
- 16 inches (40 cm) tall
- Temperature Range:
- -40°C to 50°C (-40°F to 120°F)
- Display Type:
- Analog
- Material:
- Plastic
- Special Features:
- Weatherproof, Mercury-Free, Wall Mountable
- Included Components:
- 2 Mounting Screws

8. Safety Information
This thermometer is designed for safe use. It is mercury-free, eliminating concerns associated with mercury thermometers. Always handle with care to prevent breakage. Keep out of reach of small children if mounted in an accessible area.
9. Warranty & Support
For warranty information and customer support, please refer to the product packaging or contact MARATHON directly. You can also visit the official MARATHON Store on Amazon for more details.