4-in-1 ATC Refractometer – Coolant, Urea & AdBlue Tester

4-in-1 ATC Refractometer – Coolant, Urea, AdBlue & Battery Fluid Tester

Keep your vehicle running at its best with the EAFC RHA501ATC 4-in-1 ATC Refractometer. This compact, professional-grade optical tester lets you quickly check four critical automotive fluids in one instrument — antifreeze coolant (EG & PG), automotive urea (AdBlue/DEF), windshield washer fluid, and battery electrolyte — all without batteries or complicated setup.

Built-in Automatic Temperature Compensation (ATC) across 0–30 °C ensures accurate readings regardless of ambient temperature, making it ideal for workshop professionals and DIY mechanics alike. Made in Mainland China.

What Can It Measure?

• Auto Urea / AdBlue (DEF): Concentration range 30–35% (resolution: 0.2%)
• Ethylene Glycol Antifreeze (EG): Freezing point -50 °C to 0 °C (resolution: 5 °C)
• Propylene Glycol Antifreeze (PG): Freezing point -50 °C to 0 °C (resolution: 5 °C)
• Windshield Washer Fluid (CW): Freezing point -40 °C to 0 °C (resolution: 5 °C)
• Battery Electrolyte (BF): Specific gravity 1.10–1.40 kg/L (resolution: 0.01)

Key Features

• ✅ 4-in-1 functionality — one tool replaces four separate testers
• ✅ ATC (Automatic Temperature Compensation) for reliable readings in varying conditions
• ✅ Optical refractometer design — no batteries required; uses total internal reflection principle
• ✅ Compact & lightweight — easy to store in a glove box or toolbox
• ✅ Includes protective storage box for safe transport and storage
• ✅ Easy-to-read scale — dual scale with right scale for windshield cleaner freezing point
• ✅ Ideal for cars, trucks, vans, commercial vehicles, and fleet maintenance

How It Works

The refractometer uses the total reflection critical angle method to measure the refractive index of a fluid sample. By placing just a few drops on the prism and looking through the eyepiece, you instantly read the fluid concentration or freezing point on the calibrated scale — no guesswork, no test strips.

Specifications

Care & Precautions

• Do not store in environments with relative humidity exceeding 85% to protect the optical system.
• Keep liquids away from the adjustment knob and eyepiece to avoid internal damage.
• Handle with care — avoid drops or impacts that could affect measurement accuracy.
• After each use, wipe the prism and refractive plate clean with a soft, dry cloth.

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Learn more: FuelEconomy.gov driving efficiency guidance

Frequently Asked Questions

Q: What fluids can the EAFC 4-in-1 ATC Refractometer test?

A: The refractometer tests four automotive fluids: ethylene glycol antifreeze (EG), propylene glycol antifreeze (PG), automotive urea/AdBlue (DEF) concentration, windshield washer fluid freezing point, and battery electrolyte specific gravity — all in one handy instrument.

Q: Does the ATC refractometer require batteries?

A: No — this is a fully optical instrument. It operates on the total internal reflection principle and requires no batteries at all. Simply place a few drops of fluid on the prism, close the cover, and read the result through the eyepiece.

Q: How do I calibrate or maintain this refractometer?

A: Use distilled water to zero the instrument before first use (the reading should show 0). After each test, wipe the prism plate clean with a lint-free cloth. Avoid exposing the device to high humidity or physical shocks to maintain long-term accuracy.

Q: What is the AdBlue/urea measurement range?

A: The refractometer measures automotive urea (AdBlue/DEF) concentration from 30% to 35%, with a resolution of 0.2%. This covers the standard operating concentration range required by diesel vehicles with SCR systems.