Introduction
The ETENWOLF T300 Plus Digital Tire Pressure Gauge is designed for accurate and easy measurement of tire pressure across various vehicles. This manual provides essential information for proper setup, operation, and maintenance of your device.
Package Contents
Upon unboxing, please ensure all items listed below are present:
- 1 x ETENWOLF T300 Plus Tire Pressure Gauge
- 2 x AAA Batteries
- 1 x Presta Valve Adaptor
- 1 x User Manual

Image: Contents of the ETENWOLF T300 Plus package.
Setup
1. Battery Installation
- Locate the battery compartment cover at the rear of the device.
- Slide the cover open.
- Insert two AAA batteries, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.

Image: Battery compartment with AAA batteries.
2. Unit Selection
- Press the power button to turn on the device. The display will illuminate.
- Repeatedly press the power button to cycle through the available pressure units: PSI, BAR, and KPA.
- Stop pressing when your desired unit is displayed. The device will remember this setting for future use.

Image: Digital display showing various pressure units.
Operating Instructions
1. Power On/Off and Auto-Calibration
- Press the power button once to turn on the gauge. The device will automatically calibrate, displaying '0.0' when ready.
- To turn off, press and hold the power button until the display clears. The device also features an auto-off function after a period of inactivity to conserve battery.

Image: Auto-calibration process on power-on.
2. Measuring Tire Pressure (Schrader Valve)
- Ensure the gauge is powered on and calibrated.
- Remove the valve cap from the tire.
- Firmly press the nozzle of the gauge straight onto the tire valve stem. A brief hiss may occur as the seal is made.
- Hold the gauge in place until the digital display shows a stable reading.
- Remove the gauge and replace the valve cap.

Image: Measuring tire pressure on a Schrader valve.
3. Measuring Tire Pressure (Presta Valve)
- Unscrew the small nut on the Presta valve stem.
- Screw the provided Presta valve adapter onto the valve stem.
- Firmly press the nozzle of the gauge onto the Presta valve adapter.
- Hold the gauge in place until the digital display shows a stable reading.
- Remove the gauge, unscrew the adapter, and tighten the small nut on the Presta valve.

Image: Presta valve adapter usage.

Image: Digital Tire Pressure Gauge for car and bicycle.
Video: Demonstration of the ETENWOLF T300 Plus Tire Pressure Gauge in use, showing its ease of operation and digital display.
Features
- Laboratory-Tested Precision: Calibrated to ANSI B40.7 Grade 2A (±1 PSI) with 0.1 PSI increments, ensuring accurate readings.
- Wide Pressure Range: Measures tire pressure from 3 to 200 PSI, suitable for various vehicle types including pickups, RVs, and heavy-duty vehicles.
- Accurate in Extreme Weather: Equipped with a built-in AI chip and thermal compensation, the gauge operates reliably in temperatures ranging from -4°F to 130°F (-20°C to 54°C).
- Bright LED Display and Light: Features a bright LED display for clear readings and a built-in LED light to illuminate dark areas, making tire checks effortless at night or in low-light conditions.
- Durable Construction: Designed to withstand bumps and drops, ensuring years of reliable service.

Image: Accuracy specifications of the gauge.

Image: Performance in extreme temperatures.

Image: LED light for dark environments.
Video: A demonstration of the ETENWOLF T300 Plus's durability, showing it withstands being run over by a car and remains functional.
Maintenance
- Battery Replacement: Replace AAA batteries when the display dims or the device fails to power on. Always use fresh batteries.
- Cleaning: Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or immerse the device in water.
- Storage: Store the tire pressure gauge in a cool, dry place away from direct sunlight and extreme temperatures.
Troubleshooting
- Device does not power on: Check if batteries are inserted correctly and are not depleted. Replace if necessary.
- Inaccurate readings: Ensure the nozzle is firmly pressed onto the valve stem to create a tight seal. Allow the device to auto-calibrate to '0.0' before use.
- Display is dim: Replace the AAA batteries.
Specifications
| Feature | Specification |
|---|---|
| Brand | ETENWOLF |
| Model | T300 Plus |
| Material | Plastic |
| Pressure Range | 3-200 PSI |
| Accuracy | ANSI B40.7 Grade 2A (±1 PSI) |
| Operating Temperature | -4°F to 130°F (-20°C to 54°C) |
| Power Source | 2 x AAA Batteries |
| Item Dimensions (L x W x H) | 5.91 x 1.46 x 1.22 inches |
| Item Weight | 100 Grams |
Warranty and Support
For warranty information or technical support, please contact ETENWOLF customer service:
- Email: support@etenwolf.com
- Phone: 1-877-828-0209
- Operating Hours: Monday - Friday, 8 AM - 5 PM PST