--- product_id: 585925504 title: "AS503 Engine Oil Tester - Optical Transmittance Analyzer for Gasoline & Diesel, 31.5-inch Flexible Probe, 2.8-inch Backlit LCD, Oil Temperature Gauge in °C/°F" brand: "qpking" price: "₨1307" currency: SCR in_stock: true category: "Qpking" url: https://www.desertcart.sc/products/585925504-as503-engine-oil-tester-optical-transmittance-analyzer-for-gasoline-diesel store_origin: SC region: Seychelles --- # 31.5-inch flexible PTFE probe for hard-to-reach spots Dual-mode for Gasoline & Diesel oils 2-second ultra-fast oil transmittance reading AS503 Engine Oil Tester - Optical Transmittance Analyzer for Gasoline & Diesel, 31.5-inch Flexible Probe, 2.8-inch Backlit LCD, Oil Temperature Gauge in °C/°F **Brand:** qpking **Price:** ₨1307 **Availability:** ✅ In Stock ## Summary > 🚗 Know your oil, own the road—precision testing made effortless! ## Quick Answers - **What is this?** AS503 Engine Oil Tester - Optical Transmittance Analyzer for Gasoline & Diesel, 31.5-inch Flexible Probe, 2.8-inch Backlit LCD, Oil Temperature Gauge in °C/°F by qpking - **How much does it cost?** ₨1307 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sc](https://www.desertcart.sc/products/585925504-as503-engine-oil-tester-optical-transmittance-analyzer-for-gasoline-diesel) ## Best For - qpking enthusiasts ## Why This Product - Trusted qpking brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Clear, Anytime Readout:** Large backlit LCD with ergonomic grip delivers straightforward OK/Replace alerts—no guesswork needed. - • **Instant Oil Health Check:** Get precise oil clarity results in just 2 seconds—never miss a warning before your next drive. - • **Universal Fuel Compatibility:** Optimized algorithms for both gasoline and diesel engines ensure spot-on accuracy every time. - • **Temperature-Verified Accuracy:** Built-in temp gauge confirms ideal oil warmth before testing, guaranteeing reliable readings. - • **Flexible Reach, Durable Design:** Long, oil-resistant PTFE probe slides effortlessly into tight dipstick tubes for hassle-free testing. ## Overview The QPKING AS503 Engine Oil Tester is a cutting-edge optical transmittance analyzer designed for both gasoline and diesel engines. Featuring a rapid 2-second measurement, a 31.5-inch flexible PTFE probe for hard-to-reach dipstick tubes, and a built-in temperature gauge, it delivers accurate, easy-to-read oil health diagnostics. Its large backlit LCD and ergonomic design make it perfect for DIY vehicle maintenance, backed by a 3-year warranty and lifetime support. ## Description Buy QPKING AS503 Engine Oil Tester - Optical Transmittance Analyzer for Gasoline & Diesel, 31.5-inch Flexible Probe, 2.8-inch Backlit LCD, Oil Temperature Gauge in °C/°F: Automotive - desertcart.com ✓ FREE DELIVERY possible on eligible purchases ## Features - 👍 HIGH-PRECISION OPTICAL TEST — KNOW EXACTLY WHEN TO CHANGE OIL AS503 measures oil transmittance 0-100% in just 2 seconds via advanced optoelectronic sensor. Clear OK/Replace/Warning indicators help detect impurities or metal particles before they cause engine damage. Ideal for DIY owners checking oil health before road trips. - 👍 GASOLINE & DIESEL DUAL MODE — PRECISE ASSESSMENT FOR ANY VEHICLE Separate sampling and measurement algorithms for gasoline and diesel oils ensure optimized accuracy. Whether you drive a sedan, a heavy-duty truck, or a weekend project car, AS503 delivers consistent, reliable readings every time. - 👍 800mm FLEXIBLE PTFE PROBE — TEST HARD-TO-REACH DIPSTICK TUBES WITH EASE The 31.5-inch flexible hose slides easily into narrow or angled dipstick paths. Made of oil-resistant, oxidation-proof PTFE material, it withstands repeated use and lasts significantly longer than rigid probe alternatives. - 👍 BUILT-IN TEMPERATURE SENSOR — VERIFY OIL TEMP BEFORE TESTING FOR ACCURACY Integrated gauge displays current temperature in °C/°F with a single press. Confirm your motor has reached proper operating warmth before measurement to ensure the most accurate transmittance reading possible. - 👍 2.8-INCH BACKLIT LCD & ERGONOMIC GRIP — CLEAR READINGS, ANYTIME, ANYWHERE Large high-resolution screen stays visible in low-light garages or bright sun. Silicone-lined body (only 363g) provides a secure, comfortable single-hand hold. No confusing codes — just straightforward OK/Replace results. - 👍 THREE YEARS WARRANTY, LIFETIME MAINTENANCE For the damage caused by non-human factors, we promises to resend the parts for free within 3 years. For any demand, we warmly welcome you to contact us, and we will reply you as soon as possible within 24 hours. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CG99ZLX7 | | Brand | QPKING | | Customer Reviews | 4.3 4.3 out of 5 stars (122) | | Date First Available | August 22, 2023 | | Item Weight | 13.1 ounces | | Item model number | AS503 engine oil tester | | Manufacturer | QPKING | | Manufacturer Part Number | AS503 Motoröl-Qualitätsprüfgerät | | Model | oil quality tester | | Package Dimensions | 10.04 x 5.59 x 2.32 inches | ## Images ![AS503 Engine Oil Tester - Optical Transmittance Analyzer for Gasoline & Diesel, 31.5-inch Flexible Probe, 2.8-inch Backlit LCD, Oil Temperature Gauge in °C/°F - Image 1](https://m.media-amazon.com/images/I/61J2FHUeZsL.jpg) ![AS503 Engine Oil Tester - Optical Transmittance Analyzer for Gasoline & Diesel, 31.5-inch Flexible Probe, 2.8-inch Backlit LCD, Oil Temperature Gauge in °C/°F - Image 2](https://m.media-amazon.com/images/I/71HNvkH99mL.jpg) ![AS503 Engine Oil Tester - Optical Transmittance Analyzer for Gasoline & Diesel, 31.5-inch Flexible Probe, 2.8-inch Backlit LCD, Oil Temperature Gauge in °C/°F - Image 3](https://m.media-amazon.com/images/I/71K4yX7kjXL.jpg) ![AS503 Engine Oil Tester - Optical Transmittance Analyzer for Gasoline & Diesel, 31.5-inch Flexible Probe, 2.8-inch Backlit LCD, Oil Temperature Gauge in °C/°F - Image 4](https://m.media-amazon.com/images/I/71azZM-mblL.jpg) ![AS503 Engine Oil Tester - Optical Transmittance Analyzer for Gasoline & Diesel, 31.5-inch Flexible Probe, 2.8-inch Backlit LCD, Oil Temperature Gauge in °C/°F - Image 5](https://m.media-amazon.com/images/I/61BjIHDeKhL.jpg) ## Questions & Answers **Q: Is this easy to use for someone who's not a mechanic?** A: Absolutely! It's designed for everyone.Just wipe the probe, select your engine type(gasoline or diesel), dip it in the oil, and press the button.You'll get a clear "OK" or "Replace" result on the large screen in seconds—no technical knowledge needed. **Q: How accurate is it compared to just looking at the oil color?** A: More accurate than the human eye, our optical sensor analyzes microscopic oil contaminants to give definitive percentage and temperature readings—eliminating maintenance guesswork. **Q: Does it work on both old and new cars, and for diesel trucks?** A: Yes! It is universally compatible with the majority of gasoline and diesel engine oils on the market. Separate testing modes ensure accurate assessment for each engine type, whether it's your daily car, SUV, or diesel pickup truck. **Q: Why should I buy this instead of just changing my oil regularly?** A: It helps you change oil smartly,not just regularly.It prevents you from changing oil too early (saving money)or too late (preventing engine damage).It's the fastest way to know if your oil is still good,optimizing both engine health and your wallet. **Q: How do I know this is a reliable brand?** A: The AS503 is built with professional-grade components like a PTFE-coated probe and a robust optical sensor. It comes with a clear manual and is trusted by DIYers and professionals for its simple, dependable readings. Your satisfaction is guaranteed. ## Frequently Bought Together - Engine Oil Quality Tester AS503 Engine Oil Tester for Gasoline Diesel Vehicles With 2.8"Screen High-Precision Detection Probe,Transmittance&Oil Temp.Display,Compatible With Various Lubricant Standards - TYRAREX Automotive Transmission Fluid Tester Oil Analyzer Detector with Temperature Sensor, Gasoline & Diesel Gearbox Oil Diagnostic Tool with 31.5in Hose 2.8in Backlight Display (T20) - Brake Fluid Tester, High Precision Car Brake Fluid Detector, Hydraulic Fluid/Liquid/Oil Moisture Analyzer with LCD Screen Audible Alarm DOT3 DOT4 DOT5.1 Tester,Automotive Replacement Level Sensors --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sc/products/585925504-as503-engine-oil-tester-optical-transmittance-analyzer-for-gasoline-diesel](https://www.desertcart.sc/products/585925504-as503-engine-oil-tester-optical-transmittance-analyzer-for-gasoline-diesel) --- *Product available on Desertcart Seychelles* *Store origin: SC* *Last updated: 2026-07-17*