🔍 More Powerful Detection Range
Using advanced optical sensing technology, the AUTOOL AS503 measures oil transmittance accurately (0–100%) and visually indicates contamination levels with clear status symbols:
✅ OK – Oil qualified
⚠️ △ Warning – Approaching replacement
❌ × Recommended Replacement – Change oil now
This helps users scientifically determine the optimal oil change interval, saving costs and enhancing engine performance.

⚙️ Dual-Mode Adaptation
Compatible with both gasoline and diesel engine oils, this tester meets the needs of most vehicle models. It features switchable °C/°F temperature units and displays real-time oil temperature to ensure testing is performed under safe conditions (recommended below 60°C).

🔬 Precision Test & Sensitive Probe
Equipped with an 800mm oil-resistant flexible hose, the probe resists chemical corrosion and extends service life. Its length allows easy access into dipstick holes or oil sumps for sampling. High-precision sensors ensure stable signal transmission and accurate light transmittance data without interference.

📟 Easy Instant Read
Features a 2.8-inch high-resolution LCD screen with backlight, offering clear visibility in sunlight or at night. The display shows transmittance percentage, temperature, oil type, and status prompts (e.g., warning symbols)—no professional knowledge required.

🛡️ Three-Year Warranty & Support
We offer a 3-year warranty and lifetime technical support. If any quality issue arises with the AS503, we provide prompt replacements or effective solutions. Contact us anytime—we respond within 24 hours.
Flexible Hose Probe for Convenient Testing:
The 800mm long probe design offers a more flexible & convenient way ofconducting tests. The hose is made of PTFE material,highly resistant to oil & oxidation,and boasts exceptional corrosion resistance, effectively extending the product's lifespan.		Compatible with Various Lubricant Oil Standards:
Suitable for the majority of gasoline and diesel engine lubricant oils available in the market. Separate sampling and measurement for gasoline and diesel engines allow for more precise assessment of lubricant oil health.
High-Precision Optical Probe:
Integrated with a high-precision optoelectronic sensor, ensuring more accurate measurement results.		Oil Temperature Display:
Integrated temperature sensor for convenient assessment of the engine's operating status.
Large LCD with High Definition:
Equipped with a backlit 2.8- inch LCD screen, providing users with a clear display for efficient operation even in varying lighting conditions,
be it bright daylight or dim nighttime		User-Friendly Handheld Design:
The body's handheld portion is lined with silicone substrate,providing excellent grip & lightweight design for easy single-handed operation.
Operating Steps:
Step 1: Wipe the test probe clean for the preparation
Step 2: Remove the oil dipstick
Step 3: Press the [] button to select the vehicle's engine type
Step 4:Submerge the testing probe into the engine oil
Step 5: Press the [▶] button to start the test
Step 6: The measurement result will be displayed on the screen
Specifications:
Operating Voltage:6V(4x 1.5V batteries not included) 
Operating Temperature: -10°C -60°C
Package included:
1*AS503 engine lubricant Tester(battery not included)
1* user manual 
Note: The two versions are shipped randomly.

We only accept eBay payments.
Payment should be made within 5 days after bidding ends.
 
We are not responsible for buyers' local tax and duty.
（1） Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer responsibility.
（2）Please check with your country customs office to determine what these additional costs will be prior to bidding / buying.
（3）Orders shipped from China will be charged with or without customs duty according to the amount of collection and payment on behalf of eBay. Uncollected orders will require the buyer to clear customs and pay the duty when the package arrives at the destination country. Customs clearance is the buyer's responsibility and obligation.For orders that do not include tax, buyers can note the tax code at the time of payment for customs clearance.

We only ship parcel to the address in eBay payment.Please make sure payment address in eBay is correct.

1.We usually send the package to you within 3 working days after receiving your payment (US,Germany,UK ship). Of course, except for special circumstances such as severe weather, please wait patiently.

2.Once the goods are shipped, a package tracking number will be formed, you can get it on eBay, and you can monitor the progress of the package at any time

3.Usually we ship the package from China via: Fedex,UPS/USPS, DHL,Aramex,SpeedPak,China Post etc.

from US via：UPS/USPS. 

from Germany via:GLS,DHL

from UK via:Hermes,Royal Mail

4.If you have special needs for transportation services, or urgently need to get the purchased items, please notify us before payment, or leave a message when paying, we will provide you with a solution as soon as possible.

1. Item may be returned for refund or replacement within 30 days of the purchase date. Returned merchandise must be unused, in original packaging and include all accessories. Shipping costs are non-refundable.

2. Defective products may be returned for repair up to1-3 yearfrom the purchase date. Repairs will be processed through the manufacturer, we will assist in the repair procedure in any way we can to expedite the process.

3. Before any return, a Return Merchandise Authorization (RMA) must be obtained by contacting the seller. Any products returned to us without an RMA will be sent back to the buyer at his/her expense. The buyer is responsible for the cost of returning any merchandise.
 

About TAX

1.Import duties, taxes and customs duties are not included in the item price or shipping charges.

2.Any tax fees or customs duties occurred in import country ,that should be covered by buyer. Thanks for your understanding.

3.Please check with your country customs office to determine what these additional costs will be prior to bidding / buying.

1. We are a professional worldwide wholesale company with own factory. A shop specializing in auto repair tools, please pay attention to us!

2. We are a professional Authorized dealers of AUTOOL and MRCARTOOL . Also offer reasonable prices , excellent customer service and a reliable credit standing are our target!

3. It now own four country warehouses in the world:China warehouse, United States warehouse, United Kingdom warehouse and Germany warehouse. It is now one of the biggest online commercial corporations in China.
1.Our normal business hour is Monday to Friday 9:00 AM to 6:00 PM Beijing TIME.

2.Please email me through "MY MESSAGES" on eBay, if you have any questions about our listings or inventory or troubles.  Welcome your any-time parchase!

3.In order to provide you the best service, please treat the transaction fairly.Positive Feedback and 5-stars of DSR are our life, before you leave a neutral or negative feedback.Do wish you can contact us firstly BEFORE giving us or feedback, so that we can know the problem and try our best to meet your requirements.Thank you~ 
 

4.Any question ,Pls feel free to contact us via eBay message, we will reply within 24 hours.

5. We apologize for the late reply to the question during the holidays.

6.We are a customer-centric company, and your feedback is very important to us, so please tell us what you think of our products

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