Solary SD301E
A cheap higher-pressure machine for intake and vacuum leaks. Its output is too high for EVAP testing without a regulator.
Amazon $59.99$59.99
The Solary SD301E is the better automotive smoke machine overall, rated 3.1 to 2.9. The Solary SD301E leads on value. The Solary SD301E costs $140 less ($59.99 vs $199.99).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Foxwell ST203
A gauge-equipped machine for intake, turbo and exhaust leaks. Skip it if EVAP codes are the main job.
Amazon $199.99$199.99
Which should you buy?
- Choose the Solary SD301E for value ($59.99 vs $199.99).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every no EVAP mode stated automotive smoke machine; a clear win is highlighted. How we rank explains each one.
| Factor weight | Solary SD301E | Foxwell ST203 |
|---|---|---|
| Overall rating | 3.1/5 | 2.9/5 |
| Value 30% | 93 $59.99 | 44 $199.99 |
| Pressure coverage 25% | 50 up to 23 PSI | 43 up to 17.4 PSI |
| Measurement 20% | 0 no gauge or flow meter listed, scored as none | 40 pressure gauge |
| Features 15% | 45 built-in air pump, fluid included | 50 built-in air pump, air-only mode |
| Warranty 10% | 0 1-year warranty | 0 1-year warranty |
Specifications
| Solary SD301E | Foxwell ST203 | |
|---|---|---|
| Pressure and smoke | ||
| EVAP mode | No | No |
| Output pressure | 19-23 PSI | 11.6-17.4 PSI |
| Pressure display | - | Gauge |
| Air-only mode | - | Yes |
| Power and fluid | ||
| Air source | Built-in pump | Built-in pump |
| Power | 12V battery | 12V battery |
| Smoke fluid | smoke oil | mineral oil |
| Fluid included | Yes | - |
| In the box | ||
| Cap plugs | - | 23 pieces |
| Warranty | 1 year | 1 year |