Extech
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Extech RF40 Coolant and Battery Acid Refractometer with ATC
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Extech RF40 Coolant and Battery Acid Refractometer with ATC
Get fast and accurate readings for automotive coolants and battery acid with just 2 or 3 drops of solution!
Extech RF40 Coolant and Battery Acid Refractometer with ATC
Item #: 47636992

Extech RF40 Coolant and Battery Acid Refractometer with ATC

89% of respondents would recommend this to a friend

Item #: 47636992

RWF 228835

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Get fast and accurate readings for automotive coolants and battery acid with just 2 or 3 drops of solution!
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What Stands Out

Dual-Scale Measurement
Provides quick and accurate readings for both battery acid and engine coolant, allowing users to monitor crucial automotive fluids seamlessly.
User-Friendly Design
Compact and lightweight, the Extech RF40 is easy to handle, making it ideal for professionals and DIY enthusiasts for effective fluid analysis.
Durable Construction
Built with high-quality materials, this refractometer ensures longevity and reliability, providing exceptional value for regular automotive maintenance.

Product Details

Shop Extech RF40 Coolant and Battery Acid Refractometer with ATC online at a best price in Rwanda. B098CYMFYV
Automotive Fit TypeUniversal Fit
Size6.5 x 1.5 x 1.5 inches (16.5 x 3.8 x 3.8 cm)
Item Weight0.19 kg
Item Dimensions D x W x H30"D x 8"W x 6"H (76.2 x 20.3 x 15.2 cm)
Brand NameExtech
Manufacturer Part NumberRF40
Unit Count1 Count
Model NumberRF40
ManufacturerExtech
UPC793950222409
Global Trade Identification Number00793950222409
Number of Items1
Included ComponentsRF40
Item Type NameBattery Acid and Engine Coolant Refractometer Fahrenheit
BrandExtech
Product Dimensions (L x W x H)30"D x 8"W x 6"H (76.2 x 20.3 x 15.2 cm)
Item HighlightGlycol coolant freeze point (-60 to 32F) and battery acid specific gravity, ATC, 2-3 drop, case, pipette See more

Dangerous Goods

To avoid the delay in customs clearance process for Dangerous Goods, the shipment shall be opened at our warehouse facility to check the severity of hazardous components. Please see the list of Dangerous goods here.

Who Should Buy?

Suitable For
  • Car Mechanics

    Ideal for professionals who need to accurately assess battery acid and coolant levels in various vehicles.

  • DIY Enthusiasts

    Perfect for hobbyists who perform their own vehicle maintenance and require reliable coolant and acid measurements.

  • Manufacturing Experts

    Beneficial for those working in automotive manufacturing needing precise measurements for quality control purposes.

Not Suitable For
  • Casual Car Owners

    Not ideal for users who rarely perform vehicle maintenance and seek simpler solutions for fluid checks.

Product Description

Extech RF40 Coolant and Battery Acid Refractometer with ATC

Have any Query? Chat with us

Customer Questions & Answers

  • Question: What is the Extech RF40 Refractometer primarily used for?

    Answer: The Extech RF40 Refractometer is designed for measuring battery acid and engine coolant concentration levels. It's essential for ensuring optimal performance in batteries and engines. By determining the freeze and boil protection of your coolant or checking the specific gravity of battery acid, you can prevent system failures. This device is particularly useful for automotive technicians, hobbyists, and fleet managers seeking to maintain vehicle health efficiently.
  • Question: How do I calibrate the Extech RF40 Refractometer?

    Answer: Calibrating the Extech RF40 Refractometer involves using distilled water as a reference. Simply apply a few drops of water onto the prism and adjust the calibration screw until the scale reads zero. This calibration ensures accurate data readings. Regular calibration is vital, especially before conducting important tests on battery acid or engine coolant, to maintain precision. The Refractometer should be calibrated at ambient temperature to get the best results.
  • Question: What are the temperature units displayed on the Extech RF40 Refractometer?

    Answer: The Extech RF40 Refractometer shows results in Fahrenheit. This display is crucial for regions that primarily utilize Fahrenheit and is particularly beneficial for automotive users in such areas. By having readings tailored to Fahrenheit, users can readily understand and manage their automotive fluids without needing to convert between units, thereby streamlining maintenance tasks significantly.
  • Question: Can the Extech RF40 Refractometer be used for other liquids besides battery acid and coolant?

    Answer: While the Extech RF40 is specifically designed for battery acid and engine coolant, it can also be utilized for measuring other related automotive fluids, like windshield washer fluid. However, readings may not be as accurate, since it's optimized for the specific gravity ranges of battery acid and coolant solutions. Understanding its intended use ensures you gain the most valuable data during testing, keeping your vehicle's fluids checked effectively.
  • Question: Is the Extech RF40 Refractometer portable?

    Answer: Yes, the Extech RF40 Refractometer is designed for portability. It is lightweight and comes with a protective case, making it suitable for on-the-go inspections whether at a workshop or during roadside assistance. This portability allows automotive technicians and enthusiasts to take measurements conveniently, ensuring battery and coolant levels are always optimal, no matter where they are working.
  • Question: What maintenance does the Extech RF40 Refractometer require?

    Answer: To maintain the Extech RF40 Refractometer, it's essential to keep the prism clean and free from residue. Use a soft cloth or lens tissue to wipe down the prism after each use. Regular inspections for clarity and operational accuracy are also critical. By ensuring that the instrument is well-maintained, you can enjoy accurate readings that help you make informed decisions about your fluids.
  • Question: What does 'specific gravity' mean on the Extech RF40 Refractometer?

    Answer: Specific gravity refers to the density of a liquid compared to water. On the Extech RF40 Refractometer, it provides valuable insights into the condition of battery acid and coolant. A higher specific gravity indicates a stronger concentration of acid or coolant, essential for determining their efficacy. Monitoring these readings helps prevent overheating or freezing, leading to better performance and longevity of your vehicle.
  • Question: Can beginners effectively use the Extech RF40 Refractometer?

    Answer: Absolutely! The Extech RF40 Refractometer is user-friendly and doesn’t require advanced technical skills. It operates with simple steps: add a drop of liquid, close the cover, and read the scale. This accessibility makes it ideal for both beginners and experienced users. Beginners can confidently test their vehicle's fluid concentrations, gaining a better understanding of maintenance requirements and vehicle performance.
  • Question: What is the range of measurement for the Extech RF40?

    Answer: The Extech RF40 Refractometer measures specific gravity from 1.100 to 1.300 for battery acid and provides a concentration range for engine coolant from 0°F to 50°F. This extensive measurement range allows users to gauge the condition of their automotive fluids accurately, preventing issues such as battery failure in cold temperatures or overheating during summer. Keeping track of these measurements is vital for maintaining a reliable vehicle.
  • Question: Where can I buy the Extech RF40 Battery Acid and Engine Coolant Refractometer in Rwanda?

    Answer: You can purchase the Extech RF40 Battery Acid and Engine Coolant Refractometer from Ubuy in Rwanda. Ubuy offers a seamless shopping experience with a wide range of tools and instruments including this refractometer, enabling you to monitor your automotive fluids effectively. Ubuy’s platform is user-friendly, making it easier for you to find and obtain the product you need.

Extech Refractometers RF40 Editorial Review

The Extech RF40 Battery Acid and Engine Coolant Refractometer has garnered positive feedback from customers who appreciate its quality, ease of use, and accuracy. Many users, including RV technicians and off-grid solar system owners, have found it to be a valuable tool for measuring specific gravity in lead-acid batteries and glycol levels in hydronic heating systems. The product is lauded for its high-quality Construction, featuring a robust plastic case and straightforward instructions that make it accessible even for those who may not have extensive technical knowledge. Reviews Consistently highlight the refractometer's ability to deliver reliable readings much more accurately than traditional methods such as DC volt meters or hydrometers. Users report that they can quickly evaluate multiple battery cells in minutes, leading to improved monitoring of battery health. Calibration is noted as a simple process, reinforcing the tool's user-friendly design. Customers express satisfaction with their purchases, affirming that the Extech RF40 performs as advertised and is a sound investment for anyone regularly working with lead-acid batteries. ###

Customer Reviews & Ratings

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Pros

  • High-quality Construction with a sturdy plastic case
  • Easy to use and follow instructions
  • Delivers accurate readings for battery specific gravity and glycol levels
  • Quick and efficient for checking multiple cells
  • Simplifies battery health monitoring
  • Easy calibration process ###

Cons

  • No significant Cons noted in customer reviews.

Platform Trust & Buyer Confidence

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“Easy to use and always helpful and sorts any issues I've had past and present”

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27 August 2026 · via Trustpilot
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Important information

  • Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
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RWF 228835

Order now and get it around Sunday, September 13

QTY:

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Fastest cross-border delivery

Features & Benefits

  • Measures freeze points from 32°F to -60°F for automotive coolants.
  • Indicates specific gravity of battery acid for checking charge condition.
  • Automatic Temperature Compensation ensures consistent results.
  • Requires only 2 or 3 drops for quick readings.
  • Comes complete with storage case and calibration tools.
  • Ideal for anyone needing to monitor coolant and battery health easily.

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