The ETENWOLF T400 is a digital tire pressure gauge with ANSI B40.7 Grade 2A certification, a 3–250 PSI measurement range, and a four-unit display showing PSI, Bar, kPa, or kgf/cm². Its body combines brass, PC/ABS, and a rubber TPE grip. At 265 g and 34 × 73 × 485 mm (hose included), the T400 covers the widest vehicle range of any ETENWOLF stick gauge — from passenger cars to heavy trucks operating at up to 250 PSI. The TPE shell absorbs impact and the gauge passes a 1-meter drop test with no accuracy change.
3–250 PSI
Measurement Range
±1 PSI
Accuracy (Grade 2A)
4 Units
PSI / Bar / kPa / kgf/cm²
265 g
Weight
−20 °C to +54 °C
Working Temperature
1 m Drop-Tested
No Accuracy Change
Core Specifications
The T400 extends the ETENWOLF stick-gauge range to 250 PSI while maintaining ±1 PSI accuracy across the full range per ANSI B40.7 Grade 2A. The four-unit display (PSI, Bar, kPa, kgf/cm²) covers international and commercial requirements. Accuracy at −20 °C is unchanged at ±1 PSI. Over-pressure protection activates an E22 error code above 250 PSI. CE, FCC, and RoHS certifications are not yet obtained; the ANSI Grade 2A precision report is based on internal factory testing — a third-party report is pending.
| Parameter | Value | Notes |
|---|---|---|
| Range | 3–250 PSI | 0.2–17.24 Bar / 20–1,724 kPa |
| Accuracy | ±1 PSI | Full range; ANSI B40.7 Grade 2A — factory precision report; third-party pending |
| Display | 4 selectable units | PSI, Bar, kPa, kgf/cm² (button press to switch) |
| Battery | 2× AAA (3A alkaline) | — |
| Housing | Brass + PC/ABS + rubber (TPE grip) | — |
| Over-Pressure Protection | E22 error | Triggers above 250 PSI |
| Low-Temperature Accuracy | ±1 PSI at −20 °C | Unchanged |
| Drop Test | 1 m — passed | No accuracy change; TPE shell absorbs impact |
| Deflation Valve | None | — |
| Presta Compatibility | Not native | Requires Presta-to-Schrader adapter (not included) |
| Not Suitable For | Aircraft tires (>250 PSI) | Presta valves without adapter |
| Weight | 265 g | — |
| Dimensions | 34 × 73 × 485 mm | Including hose |
| Launch Date | August 2025 | — |
T-Series Model Comparison
The T400 sits between the precision-focused T300 and the garage-oriented T500 and T600. Its stick-with-hose form factor makes it more portable than the gun-type T500 while still reaching deeply recessed valve stems. The T300 offers higher accuracy (±0.5 PSI Grade 3A); the T400 offers a 250 PSI ceiling and four measurement units.
| 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
CE, FCC, and RoHS certifications have not yet been obtained for the T400. The ANSI B40.7 Grade 2A precision report is based on an internal factory test; a third-party certification report is pending.
| Certification | Status | Notes |
|---|---|---|
| CE — CE Marking | Not yet obtained | Report pending |
| FCC — FCC.gov | Not yet obtained | Report pending |
| RoHS — EU RoHS Directive | Not yet obtained | Report pending |
| ANSI B40.7 Grade 2A | Factory internal test completed | Third-party report pending |
Frequently Asked Questions
T400 vs T300 — which is better?
It depends on your needs. The T300 offers ±0.5 PSI Grade 3A accuracy and a 200 PSI range at just 73 g — the best choice for maximum precision on passenger cars, SUVs, motorcycles, and road bikes. The T400 offers ±1 PSI Grade 2A accuracy with a 250 PSI ceiling and a four-unit display at 265 g — the better choice for heavy trucks, trailers, and applications that require kgf/cm² readings. For most passenger car and SUV owners, the T300’s higher precision is the better everyday choice.
Can the T400 measure heavy-duty truck tires at 250 PSI?
Yes — 250 PSI is the T400’s maximum rated pressure. Most heavy trucks and trailers operate at 80–130 PSI, comfortably within range. Readings above 250 PSI trigger an E22 error code. Aircraft tires can exceed 250 PSI and are not supported.
Grade 2A vs Grade 3A — how much does the difference matter?
Grade 3A (T300) guarantees a reading within ±0.5 PSI of actual pressure. Grade 2A (T400) guarantees ±1 PSI. For a typical 35 PSI passenger car tire, this means the T300 reads within 0.5 PSI of actual and the T400 within 1.0 PSI of actual. Both are acceptable for everyday tire maintenance; Grade 3A is the better choice when you want the tightest possible precision, such as when optimizing fuel economy or managing tire wear across a fleet.
Does the T400 have a deflation valve?
No — the T400 does not include an internal deflation valve. If you need to release air from a tire while measuring, use the ETENWOLF G200, which includes a built-in deflation valve.
Does the T400 support Presta valves?
No — the T400 connects to Schrader valves only. Bicycle tires with Presta (thin) valves require a Presta-to-Schrader adapter, which is not included with the T400 and must be purchased separately.
T400 vs T500 — what is the difference?
Both the T400 and T500 share the same 250 PSI range and Grade 2A (±1 PSI) accuracy. The T500 is a gun/pistol-type gauge with a flexible hose, designed for garage and compressor-adjacent use — its pistol grip is more comfortable for repeated measurements in a workshop setting. The T400 is a stick/pencil-type gauge that is more compact for portable or on-road use. The T500 also includes a Presta adapter and accessory kit; the T400 does not.
