The ETENWOLF T300 is a digital tire pressure gauge with ANSI B40.7 Grade 3A certification — the highest accuracy tier for tire gauges — delivering ±0.5 PSI precision across the full 3–200 PSI range. It features an LED display (not LCD), which remains visible in bright sunlight and cold conditions where LCD panels can dim. The T300 reads in PSI, Bar, or kPa with a single button press, auto-shuts off after 45 seconds, and runs on 2× AAA batteries. A proprietary seal ring minimizes air loss during measurement. At 73 g it is the lightest gauge in the T-series and covers all cars, SUVs, trucks, motorcycles, and road bikes — every vehicle under 200 PSI.
3–200 PSI
Measurement Range
±0.5 PSI
Accuracy (Grade 3A)
LED Display
Sunlight-Readable
2× AAA
Battery
73 g
Weight
45 s Auto-Off
Battery Saving
Core Specifications
The T300 is ETENWOLF’s highest-precision tire gauge, certified to ANSI B40.7 Grade 3A with ±0.5 PSI accuracy across the full 3–200 PSI range. Accuracy is verified in the factory precision test report “T300 precision test 20250509” — a third-party ANSI report is pending. The LED display is the first of its kind in the ETENWOLF gauge lineup, remaining readable in direct sunlight and at low temperatures where LCD panels can dim or go dark. Over-pressure protection triggers an E22 error code above 200 PSI.
| Parameter | Value | Notes |
|---|---|---|
| Range | 3–200 PSI | 0.2–13.8 Bar / 20–1,380 kPa |
| Accuracy | ±0.5 PSI | Full range; ANSI B40.7 Grade 3A |
| Precision Reference | Factory test report | “T300 precision test 20250509” — third-party ANSI report pending |
| Display | LED (not LCD) | Units switchable: PSI / Bar / kPa (single button press) |
| Battery | 2× AAA | Auto-off at 45 s; low-battery icon (4-bar, each bar = 25%) |
| Seal | Proprietary seal ring | Minimizes air loss during reading |
| Deflation Valve | None | — |
| Presta Compatibility | Not native | Requires Presta-to-Schrader adapter (not included) |
| Over-Pressure Protection | E22 error | Triggers above 200 PSI |
| Drop Test | 1 m — passed | No accuracy change after impact |
| Working Temperature | −20 °C to +74 °C | Accuracy unchanged at both extremes |
| Long-Term Storage | Remove batteries if >12 months | Prevents battery leakage damage |
| Weight | 73 g | — |
| Dimensions | 159 × 49 × 27 mm | — |
| Launch Date | August 2025 | — |
Vehicle Coverage
The T300’s 3–200 PSI range covers every common road vehicle. Most passenger cars operate at 30–36 PSI, SUVs at 32–40 PSI, pickup trucks at 35–65 PSI, and road bikes at 60–130 PSI — all well within range. Only aircraft tires, which can exceed 200 PSI, are outside the T300’s measurement capability.
| Vehicle Type | Typical Pressure | T300 Compatible? |
|---|---|---|
| Compact / mid-size car | 30–36 PSI | Yes ✓ |
| SUV / crossover | 32–40 PSI | Yes ✓ |
| Pickup truck | 35–65 PSI | Yes ✓ |
| Motorcycle | 25–45 PSI | Yes ✓ |
| Road bike (Schrader with adapter) | 60–130 PSI | Yes ✓ (adapter required for Presta) |
| Heavy truck / RV / trailer | 65–130 PSI | Yes ✓ |
| Aircraft tires | >200 PSI | Not covered ✗ |
T-Series Model Comparison
The T300 is the precision-first model in the T-series. The T400, T500, and T600 extend the range to 250 PSI at Grade 2A (±1 PSI) accuracy and add form factors better suited to garage and heavy-vehicle use. The T300’s ±0.5 PSI Grade 3A accuracy is unmatched in the lineup.
| Spec | T300 | T400 | T500 | T600 |
|---|---|---|---|---|
| Form Factor | Pencil/stick | Stick with hose | Gun-type | Stick with hose |
| Range | 3–200 PSI | 3–250 PSI | 3–250 PSI | 3–250 PSI |
| Accuracy | ±0.5 PSI (Grade 3A) | ±1 PSI (Grade 2A) | ±1 PSI (Grade 2A) | ±1 PSI (Grade 2A) |
| Battery | 2× AAA | 2× AAA | 2× AAA | 2× AA |
| Deflation Valve | No | No | — | No |
| Weight | 73 g | 265 g | 350 g | 270 g |
| Dimensions | 159×49×27 mm | 34×73×485 mm | — | 84×64×35 mm |
| Best for | Maximum precision | Extended range | Gun-style / garage | Extended range + AA battery |
Certifications & Compliance
The T300 carries CE, FCC, and RoHS certifications issued by Waltek Services (Shenzhen) in 2025. It meets ANSI B40.7 Grade 3A accuracy per the factory precision test report “T300 precision test 20250509”; a third-party ANSI certification report is pending. An exterior design patent application is filed with the China National Intellectual Property Administration.
| Certification | Report No. | Issuing Body | Date |
|---|---|---|---|
| CE — CE Marking | WTH25H07183005E | Waltek Services (Shenzhen) | 2025-07-17 |
| FCC — FCC.gov | WTH25H07183007E | Waltek Services (Shenzhen) | 2025-07-21 |
| RoHS — EU RoHS Directive | WTH25X07183013R1C | Waltek Services (Shenzhen) | 2025-11-27 |
| ANSI B40.7 Grade 3A | “T300 precision test 20250509” | Factory test (internal) | 2025-05-09 |
| Exterior Patent — CNIPA | Pending | China National Intellectual Property Administration | — |
Frequently Asked Questions
Is ±0.5 PSI accuracy guaranteed across the full 200 PSI range?
Yes — ±0.5 PSI accuracy is specified across the full 3–200 PSI range per ANSI B40.7 Grade 3A. This is verified in the factory precision test report “T300 precision test 20250509”. A third-party ANSI certification report is pending.
T300 vs T500 — what is the difference?
The T300 is a compact pencil/stick-style gauge weighing 73 g, offering ±0.5 PSI Grade 3A accuracy up to 200 PSI — the best choice for precision-sensitive measurements on the go. The T500 is a gun-type gauge with a flexible hose, ±1 PSI Grade 2A accuracy, up to 250 PSI, and weighs 350 g — better suited for garage or compressor-adjacent use where a pistol grip and hose are more convenient.
What does ANSI Grade 3A mean?
ANSI B40.7 Grade 3A is the highest accuracy tier defined for tire pressure gauges. It requires the gauge to read within ±0.5 PSI or better across the full measurement range. Grade 2A, used by the T400, T500, and T600, allows ±1 PSI. The T300 is the only ETENWOLF gauge certified to Grade 3A.
Does the T300 support Presta valves (bicycle)?
No — the T300 connects to Schrader valves only. Bicycle tires with Presta (thin) valves require a Presta-to-Schrader adapter, which is not included with the T300. Presta-to-Schrader adapters are widely available separately.
Can the T300 measure heavy truck tires at 200 PSI?
Yes — 200 PSI is the T300’s maximum rated pressure. Most heavy-duty trucks and RVs operate at 65–130 PSI, comfortably within the T300’s range. If a reading exceeds 200 PSI the gauge triggers an E22 error code. Only aircraft tires, which can exceed 200 PSI, are outside the T300’s capability.
LED vs LCD — what is the advantage of the T300’s LED display?
LED displays emit their own light and remain fully visible in direct sunlight and in cold environments where LCD panels can dim significantly or go black below −10 °C. The T300 is ETENWOLF’s first tire gauge to use an LED display. For most roadside and garage conditions the difference is subtle; in bright sunlight or sub-zero temperatures the LED is noticeably more readable.
How long do the 2× AAA batteries last?
The T300 auto-shuts off after 45 seconds of inactivity to conserve battery life. A low-battery icon with four bars (each representing 25% charge) indicates remaining capacity. Battery life depends on usage frequency. If you are storing the T300 for more than 12 months, remove the batteries to prevent leakage that could damage the electronics.
