AutoLine Pro Model 703B
The cheapest machine here that covers both EVAP and boost leaks. It suits DIY owners who can do without a gauge.
Amazon $62.18$62.18
The AutoLine Pro Model 703B is the better automotive smoke machine overall, rated 3.9 to 3.4. The AutoLine Pro Model 703B leads on warranty, value and pressure coverage. The Foxwell ST100 wins on features. The AutoLine Pro Model 703B costs $47.81 less ($62.18 vs $109.99).
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 ST100
A compact two-pressure machine from a known scan-tool maker, for DIY owners who need both EVAP and boost testing.
Amazon $109.99$109.99
Which should you buy?
- Choose the AutoLine Pro Model 703B for warranty (3-year warranty vs 1-year warranty), value ($62.18 vs $109.99) and pressure coverage (EVAP-safe low pressure, up to 20 PSI vs EVAP-safe low pressure, up to 17 PSI).
- Choose the Foxwell ST100 for features (built-in air pump, air-only mode, EVAP adapter vs built-in air pump, air-only mode).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every with an EVAP mode automotive smoke machine; a clear win is highlighted. How we rank explains each one.
| Factor weight | AutoLine Pro Model 703B | Foxwell ST100 |
|---|---|---|
| Overall rating | 3.9/5 | 3.4/5 |
| Value 30% | 91 $62.18 | 68 $109.99 |
| Pressure coverage 25% | 100 EVAP-safe low pressure, up to 20 PSI | 92 EVAP-safe low pressure, up to 17 PSI |
| Measurement 20% | 0 no gauge or flow meter listed, scored as none | 0 no gauge or flow meter listed, scored as none |
| Features 15% | 50 built-in air pump, air-only mode | 65 built-in air pump, air-only mode, EVAP adapter |
| Warranty 10% | 100 3-year warranty | 0 1-year warranty |
Specifications
| AutoLine Pro Model 703B | Foxwell ST100 | |
|---|---|---|
| Pressure and smoke | ||
| EVAP mode | Yes | Yes |
| Output pressure | 1-20 PSI | 0.5-17 PSI |
| Air-only mode | Yes | Yes |
| Power and fluid | ||
| Air source | Built-in pump | Built-in pump |
| Power | 12V battery | 12V battery |
| Smoke fluid | - | mineral oil |
| In the box | ||
| EVAP adapter | - | Yes |
| Warranty | 3 years | 1 year |