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AUTOOL SDT205S Automotive Smoke Tester with Pressure & Flow Control
US$249.00
Key Features
- Self-Contained Air + Smoke Modes
- Pressure & Flow Feedback
- Adjustable Flow Control
- Complete Sealing Adapter Kit
- Self-Contained Air + Smoke Modes: The built-in pump lets you check with clean airflow first, then switch to smoke for visual leak location.
- Pressure & Flow Feedback: Monitor pressure behavior and relative airflow together for more context during a sealed test.
- Adjustable Flow Control: Tune airflow for different pipe volumes and test conditions instead of relying on one fixed output.
- Complete Sealing Adapter Kit: Includes an EVAP connector, valve-core wrench, airbag, cone, rubber plugs, and small adapter for common test openings.
- 3-Year Warranty Main unit 3 years · Accessories 1 year
- 90-Day Returns Eligible returns within 90 days
- Official Store Genuine products · Direct support
AUTOOL SDT205S · Dual-Mode Smoke Leak Detector with Pressure Gauge & Flow Control
Check Pressure and Flow Before You Add Smoke
The AUTOOL SDT205S is a 12V automotive smoke leak tester with a built-in air pump and separate Air Mode and Smoke Mode. A pressure gauge, flow meter window, and flow adjustment knob help you monitor and control the test. It supports low-pressure leak checks on intake, exhaust, EVAP, crankcase, fuel-tank, vehicle-sealing, and line-fitting systems.
- Air / Smoke Dual Modes
- Pressure Gauge
- Flow Meter + Adjustable Flow
- 5-Second Smoke Output
Built-InAir Pump
EVAP / VacuumLeak Checks
Oil DrainValve
3 YearsMain Unit Warranty
Core leak-detection capabilities
Key Features
SDT205S combines separate Air and Smoke modes with a built-in air pump, pressure monitoring, and flow control. It supports low-pressure checks across EVAP, intake, exhaust, crankcase, fuel-tank, vehicle-sealing, and line-fitting systems. An oil drain valve simplifies maintenance, and the main unit is backed by 3-year warranty support.
Air Mode and Smoke Mode
Switch between Air Mode for pressure and flow checks and Smoke Mode for visual leak location.
Built-In Air Pump
No external air compressor is required. The built-in air pump keeps setup simple for workshop and mobile repair use.
Pressure Gauge Monitoring
The pressure gauge lets you monitor line pressure. A falling reading may indicate a leak that needs further inspection.
Flow Meter Window
The flow meter window lets you monitor airflow through the connected test line.
Flow Adjustment Knob
Use the flow adjustment knob to match airflow to the connected test line and test setup.
Smoke Starts in About 5 Seconds
Smoke starts quickly to reduce waiting time during leak checks. The connected test line may fill with smoke in about 30 seconds, depending on system volume and sealing.
EVAP and Vacuum Leak Checks
Supports EVAP and vacuum-related low-pressure leak tests when adapters and ports that match the vehicle test connection are used.
Vehicle System Leak Checks
Use it for low-pressure leak checks on intake, exhaust, crankcase, fuel-tank, vehicle-sealing, and line-fitting systems.
Oil Drain Valve
The oil drain valve helps remove old testing oil before refilling, supporting cleaner maintenance and more stable smoke output.
Portable Design
The compact body, handle, hanging setup, cone adapter, and airbag adapter make the unit easier to position, store, and connect during testing.
Overheat and Low-Temperature Protection
The protection system shuts down power when the internal temperature exceeds 75°C and supports low-temperature use.
12V Powersports, Light-Truck and Speedboat Coverage
Compatible with motorcycles, ATVs, snowmobiles, and off-road vehicles using 12V DC power. It can also assist with low-pressure line-system leak checks on light trucks and speedboats when used within the stated test limits.
3-Year Warranty Support
Main unit: 3-year warranty. Standard accessories: 1-year warranty. Warranty Policy
Step-by-step smoke leak testing
Step-by-Step Instructions
Use SDT205S with a 12V DC battery and 10–15 mL liquid paraffin or baby oil. Open the airflow regulator before testing. Use Air Mode to monitor pressure and airflow, then switch to Smoke Mode when you are ready to locate a low-pressure leak visually.
Step 01
Add Testing Oil
Fill 10–15 mL baby oil or liquid paraffin into the detector before use. Do not overfill.
Step 02
Open the Regulator
Gently turn the knob to open the airflow regulator valve, then select Air Mode or Smoke Mode for the next step.
Step 03
Connect the Test Line
Access the system to be tested and position the detector near the test area. Disconnect the line you want to test, then connect that line to the detector.
Step 04
Connect 12V DC Power
Connect the detector to a 12V DC vehicle battery, then turn on the power switch to start the detector.
Step 05
Observe Pressure and Flow
Monitor the pressure gauge and flow meter window during the test. Adjust airflow carefully to suit the connected test line and test setup.
Step 06
Locate Leaks
After smoke enters the connected test line, inspect for escaping smoke to locate leaks. Use a headlamp if necessary for easier inspection.
Air/Smoke modes, pressure and airflow monitoring, testing oil, heat, and low-pressure limits
Safety & Compatibility
SDT205S has separate Air and Smoke modes plus a pressure gauge, flow meter, and airflow regulator. Use Air Mode to watch pressure and airflow, adjust flow gradually, then switch to Smoke Mode for visual leak location. These controls do not increase the pressure allowed for the system under test.
12V Power and Built-In Air Pump
Connect SDT205S to a 12V DC vehicle battery before use. The built-in air pump provides the test airflow, so you do not need an external compressor.
Start with Air Mode, Then Switch to Smoke
Use Air Mode first to watch pressure and airflow in the connected test path. Switch to Smoke Mode when you are ready to locate the leak visually.
Watch Pressure and Airflow Within Service Limits
SDT205S outputs less than 15 psi and less than 6 L/min. Use the pressure gauge and flow meter to watch the test, and open the airflow regulator gradually. Adjusting flow does not allow you to exceed the system’s permitted test pressure.
Add 10–15 mL of Testing Oil
Use liquid paraffin or baby oil as testing oil. Add 10–15 mL before use and do not overfill.
Drain Old Oil Before Refilling
Add fresh oil only when the smoke output becomes thin. Use the oil drain valve to remove remaining or excess oil before refilling, and do not add more than 15 mL at one time.
Limit Continuous Use to 8 Minutes
Do not run SDT205S continuously for more than 8 minutes. Automatic overheat protection stops operation above 75°C. Let the unit cool before restarting.
Do Not Use for Direct High-Pressure A/C Testing
Do not introduce smoke into high-pressure systems or any component excluded by the vehicle or component service procedure. SDT205S cannot directly pressure-test an automotive A/C system; use smoke only as an indirect aid on an isolated section where permitted.
Hot Surface Warning
The round metal housing can become hot during use. Avoid touching hot surfaces directly.
Compare AUTOOL smoke leak detector models
Compare Smoke Leak Detector Models
Compare AUTOOL smoke leak detector models by air source, pressure, output flow, operating mode, gauges, flow control, oil handling, vehicle power compatibility, and other model-specific features.
Compare models
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| Specification | Model 1AUTOOL SDT203 | Model 2AUTOOL SDT50 | Model 3AUTOOL SDT60 | Model 4AUTOOL SDT100 | Model 5AUTOOL SDT101 | Model 6AUTOOL SDT102 | Model 7AUTOOL SDT103 | Model 8AUTOOL SDT106 | Model 9AUTOOL SDT205 | Model 1AUTOOL SDT205S | Model 11AUTOOL SDT206 | Model 12AUTOOL SDT208 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Core Output and Power | ||||||||||||
| How It Works | Low-Oxygen Combustion | Low-Oxygen Combustion | Low-Oxygen Combustion | Low-Oxygen Combustion | Low-Oxygen Combustion | Low-Oxygen Combustion | Low-Oxygen Combustion | Low-Oxygen Combustion | Low-Oxygen Combustion | Low-Oxygen Combustion | Low-Oxygen Combustion | Low-Oxygen Combustion |
| Input Power | 12V DC | 12V DC | 12V DC | 12V DC | 12V DC / 5A | 12V DC | 12V DC / 5A | 12V DC | 12V DC | 12V DC | 12V DC | 12V / 24V DC |
| Testing Oil Fill Volume | 10–15 mL | 10–15 mL | 10–15 mL | 10–15 mL | 10–15 mL | 10–15 mL | 10–15 mL | 10–15 mL | 10–15 mL | 10–15 mL | 10–15 mL | 10–15 mL |
| Rated Output Pressure | <15 psi | <10 psi | <10 psi | <10 psi | 3.2 kPa (0.46 psi) | <10 psi | 3.2 kPa (0.46 psi) | <12 psi | <15 psi | <15 psi | <18 psi | <10 psi EVAP / 35 psi Standard |
| Rated Output Flow | <6 L/min | <5 L/min | <5 L/min | <5 L/min | >10 L/min | >6 L/min | >10 L/min | <5 L/min | <6 L/min | <6 L/min | <6 L/min | <15 L/min |
| Rated Power | 65 W | 50 W | 50 W | 50 W | 48 W | 48 W | 48 W | 50 W | 65 W | 65 W | 70 W | 80 W |
| High-Temperature Protection | Automatic shutdown above 75°C | Automatic shutdown above 75°C | Automatic shutdown above 75°C | Automatic shutdown above 75°C | Automatic shutdown above 75°C | Automatic shutdown above 75°C | Automatic shutdown above 75°C | Automatic shutdown above 75°C | Automatic shutdown above 75°C | Automatic shutdown above 75°C | Automatic shutdown above 75°C | Automatic shutdown above 75°C |
| Response Time | Produces smoke in 5 seconds | Produces smoke in 5 seconds | Produces smoke in 5 seconds | Produces smoke in 5 seconds | Produces smoke in 5 seconds | Produces smoke in 5 seconds | Produces smoke in 5 seconds | Produces smoke in 5 seconds | Produces smoke in 5 seconds | Produces smoke in 5 seconds | Produces smoke in 5 seconds | Produces smoke in 5 seconds |
| Monitoring and Control | ||||||||||||
| Flow Meter Window | Included | Not included | Not included | Not included | Not included | Not included | Included | Not included | Not included | Included | Included | Included |
| Pressure Gauge | Included | Not included | Included | Not included | Not included | Included | Not included | Not included | Included | Included | Included | Included |
| Flow Adjustment Knob | Included | Not included | Not included | Not included | Not included | Not included | Included | Not included | Not included | Included | Included | Included |
| Fault Indicator Light | Included | Not included | Not included | Included | Not included | Included | Not included | Not included | Included | Included | Included | Included |
| Oil Level Gauge | Not included | Not included | Not included | Not included | Not included | Not included | Not included | Not included | Not included | Not included | Included | Included |
| Air Source and Operating Modes | ||||||||||||
| Air Source Type | Built-in Air Pump | Built-in Air Pump | Built-in Air Pump | Built-in Air Pump | External Air Source | Built-in Air Pump | External Air Source | Built-in Air Pump | Built-in Air Pump | Built-in Air Pump | Dual Built-In Air Pumps | Built-in Air Pump |
| Operating Modes | Smoke Mode | Smoke Mode | Smoke Mode | Smoke Mode | Smoke Mode | Smoke Mode | Smoke Mode | Smoke Mode | Air Mode / Smoke Mode | Air Mode / Smoke Mode | Air Mode / Smoke Mode | Air Mode / Smoke Mode |
| Dual Pressure Mode | Not included | Not included | Not included | Not included | Not included | Not included | Not included | Not included | Not included | Not included | Not included | Standard Mode (35 psi) / EVAP Mode (10 psi) |
| Oil Drain Valve | Not included | Not included | Not included | Not included | Not included | Not included | Not included | Not included | Included | Included | Included | Included |
| Size and Weight | ||||||||||||
| Net Weight (Main Unit) | 1.7 kg | 1.5 kg | 1.6 kg | 1.6 kg | 1.6 kg | 1.6 kg | 1.15 kg | 3.5 kg | 3.2 kg | 3.2 kg | 3.5 kg | 4.2 kg |
| Main Unit Dimensions | 145 × 80 × 200 mm | 145 × 80 × 200 mm | 145 × 80 × 200 mm | 180 × 102 × 143 mm | 180 × 100 × 135 mm | 180 × 102 × 143 mm | 180 × 100 × 135 mm | 110 × 135 × 210 mm | 295 × 295 × 207 mm | 295 × 295 × 207 mm | 150 × 150 × 275 mm | 350 × 250 × 300 mm |
Model Guide
Use this overview to identify the smoke leak detector models you want to compare in detail.
AUTOOL SDT203
Built-in air pump · <15 psi rated output pressure · <6 L/min rated output flow · Smoke Mode
AUTOOL SDT50
Built-in air pump · <10 psi rated output pressure · <5 L/min rated output flow · Smoke Mode
AUTOOL SDT60
Built-in air pump · <10 psi rated output pressure · <5 L/min rated output flow · Smoke Mode
AUTOOL SDT100
Built-in air pump · <10 psi rated output pressure · <5 L/min rated output flow · Smoke Mode
AUTOOL SDT101
External air source · 3.2 kPa (0.46 psi) rated output pressure · >10 L/min rated output flow · Smoke Mode
AUTOOL SDT102
Built-in air pump · <10 psi rated output pressure · >6 L/min rated output flow · Smoke Mode
AUTOOL SDT103
External air source · 3.2 kPa (0.46 psi) rated output pressure · >10 L/min rated output flow · Smoke Mode
AUTOOL SDT106
Built-in air pump · <12 psi rated output pressure · <5 L/min rated output flow · Smoke Mode
AUTOOL SDT205
Built-in air pump · <15 psi rated output pressure · <6 L/min rated output flow · Air Mode / Smoke Mode
AUTOOL SDT205S
Built-in air pump · <15 psi rated output pressure · <6 L/min rated output flow · Air Mode / Smoke Mode
AUTOOL SDT206
Two built-in air pumps · <18 psi rated output pressure · <6 L/min rated output flow · Air Mode / Smoke Mode
AUTOOL SDT208
Built-in air pump · <10 psi EVAP / 35 psi Standard rated output pressure · <15 L/min rated output flow · Air Mode / Smoke Mode
What’s in the Box
Package Contents
SDT205S package contents are shown below.
- Power cord ×1Included
- Smoke outlet hose ×1Included
- Cone adapter ×1Included
- Valve core wrench ×1Included
- EVAP connector ×1Included
- Filling bottle ×1Included
- Universal airbag adapter ×1Included
- Universal hard rubber plug ×1 setIncluded
- Universal small adapter ×1Included
- User manual ×1Included
Manual, warranty, and setup support
Manual and Downloads
Use the manual below for SDT205S setup, operation, maintenance, and safety guidance.
AUTOOL SDT205S Multi-Language User Manual
Open the PDF manual for SDT205S operation and setup guidance.
Frequently asked questions
Frequently Asked Questions
What Testing Oil Should I Use for SDT205S?
If dedicated smoke-testing oil is unavailable, use liquid paraffin or baby oil. Testing oil is usually not included.
How Much Testing Oil Should I Add?
Add 10–15 mL testing oil before use. Do not add more than 15 mL each time. Refill only when smoke becomes thin, and drain remaining testing oil before adding fresh oil. If too much oil is added accidentally, drain some oil out before operation.
Can SDT205S Directly Test Automotive A/C System Leaks?
No. The automotive A/C system operates at about 1.7–3.0 MPa output pressure, while AUTOOL smoke leak detectors generate much lower pressure. SDT205S cannot directly pressure-test the automotive A/C system for leaks. Use smoke only to help inspect an A/C line section after isolating and pressurizing it according to the service procedure.
How Can I Use Smoke to Check an Isolated A/C Line Section?
First isolate and pressurize the A/C line segment according to the vehicle or A/C service procedure. Then apply smoke near the suspected area and observe whether escaping airflow disturbs the smoke. If escaping air moves the smoke, inspect that area for a possible leak.
Can SDT205S Detect EVAP Leaks?
Yes. AUTOOL smoke leak detectors can test EVAP system leaks. Use the EVAP adapter or service tool that matches the vehicle test port.
What Systems Can SDT205S Test?
SDT205S supports low-pressure checks for intake, exhaust, vehicle-sealing, crankcase, fuel-tank, EVAP, vacuum-line, and line-fitting systems. It is not a direct pressure tester for high-pressure A/C systems.
What Power Supply Does SDT205S Need?
SDT205S runs on a 12V DC vehicle battery. Connect it to a 12V vehicle battery before operation.
Can I Adjust the Pressure on SDT205S?
SDT205S uses fixed output below 15 psi. Its flow adjustment knob controls airflow, not pressure mode. If separate Standard and EVAP pressure modes are required, compare SDT208.
What Accessories Are Included?
Accessories vary by model and package option. Depending on the package, items may include rubber adapters, a cone adapter, an airbag adapter, EVAP testing tools, a smoke hose, and a power cable. Other items may include a testing oil bottle, user manual, warranty card, and quality certificate. Check the SDT205S package contents on the product page for the exact included items.
How Do AUTOOL Smoke Leak Detector Models Differ?
SDT101 and SDT103 use external air sources at 3.2 kPa (0.46 psi) EVAP pressure. SDT106 uses a built-in pump with rated output below 12 psi. SDT203, SDT205, and SDT205S use built-in pumps with rated output below 15 psi. SDT206 uses two built-in air pumps with rated output below 18 psi. SDT208 provides a 35 psi Standard mode and a 10 psi EVAP mode. Compare air source, pressure, flow, output modes, flow monitoring, oil drainage, and included accessories to choose the model that fits your work.
How Long Is the Warranty for SDT205S?
The SDT205S main unit has a 3-year limited warranty, and standard accessories have a 1-year limited warranty. See the Warranty Policy for coverage and exclusions. Contact support for setup, accessory, or troubleshooting help.
Customer Reviews
Leave A Review
Walmart Customer (verified owner) –
Awesome tool to streamline workflow
item was a godsend! I typically do a rather simple boost leak test on cars prior to ecu recalibration, but with this smoke machine I can REALLY tell if its leaking and from exactly where!
C. Hayes (verified owner) –
Dependable tester
Works great and made great I would also recommend it to anyone.
WB (verified owner) –
Smoking machine!
Would give five stars, but dies not come with any smoke oil. Works very fast at generating smoke and lots of it.