---
product_id: 377673271
title: "RF40 Battery Acid and Engine Coolant Refractometer Fahrenheit black"
brand: "extech"
price: "HK$1653"
currency: HKD
in_stock: true
url: https://www.desertcart.hk/products/377673271-rf40-battery-acid-and-engine-coolant-refractometer-fahrenheit-black
store_origin: HK
region: Hong Kong
---

# 1.11 to 1.30 battery acid specific gravity Only 2-3 drops needed per test Measures -60 to 32°F freeze point RF40 Battery Acid and Engine Coolant Refractometer Fahrenheit black

**Brand:** extech
**Price:** HK$1653
**Availability:** ✅ In Stock

## Summary

> 🔧 Stay Cool & Charged: The Ultimate Refractometer for Pro-Level Vehicle Care

## Quick Answers

- **What is this?** RF40 Battery Acid and Engine Coolant Refractometer Fahrenheit black by extech
- **How much does it cost?** HK$1653 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/377673271-rf40-battery-acid-and-engine-coolant-refractometer-fahrenheit-black)

## Best For

- extech enthusiasts

## Why This Product

- Trusted extech brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Complete Professional Kit:** Includes case, calibration screwdriver, pipette, and calibration solution—ready for on-the-go diagnostics.
- • **Minimal Sample Requirement:** Requires just 2-3 drops of fluid, making testing quick, clean, and efficient.
- • **Precision Freeze Point Detection:** Accurately gauges propylene/ethylene glycol freeze points from -60 to 32°F for ultimate engine protection.
- • **Automatic Temperature Compensation:** Ensures flawless readings regardless of ambient temperature—no manual adjustments needed.
- • **Battery Acid Specific Gravity Insight:** Measures battery acid density between 1.11 and 1.30 to keep your power source in peak condition.

## Overview

The Extech RF40 is a portable, precision refractometer designed for professional-grade measurement of battery acid specific gravity and engine coolant freeze points in Fahrenheit. Featuring automatic temperature compensation and requiring minimal sample volume, it comes complete with all necessary calibration tools for reliable, on-the-spot vehicle maintenance.

## Description

RF40 Battery Acid and Engine Coolant Refractometer Fahrenheit black

## Features

- Measures -60 to 32°F Propylene/Ethylene Glycol freeze point and 1.11 to 1.30 Specific Gravity of Battery Acid
- Automatic Temperature Compensation (ATC)
- Requires only 2 or 3 drops of solution
- Complete with case, calibration screwdriver, plastic pipette and calibration solution

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Extech Instruments |
| Part number | RF40 |
| Item Weight | 190 g |
| Product Dimensions | 16.51 x 3.81 x 3.81 cm; 190 g |
| Item model number | RF40 |
| Size | 6.5 x 1.5 x 1.5 inches |
| Color | black |
| Style | Fahrenheit |
| Material | Other |
| Power source type | Corded-electric |
| Item Package Quantity | 1 |
| Special Features | Portable |
| Included components | RF40 |
| Batteries Included? | No |
| Batteries Required? | No |

## Product Details

- **Brand:** Extech
- **Size:** 6.5 x 1.5 x 1.5 inches
- **Item weight:** 0.19 Kilograms
- **Product dimensions:** 76.2D x 20.3W x 15.2H centimeters
- **Automotive Fit Type:** Universal Fit

## Images

![RF40 Battery Acid and Engine Coolant Refractometer Fahrenheit black - Image 1](https://m.media-amazon.com/images/I/51HyCpLvMvL.jpg)
![RF40 Battery Acid and Engine Coolant Refractometer Fahrenheit black - Image 2](https://m.media-amazon.com/images/I/51HyCpLvMvL.jpg)
![RF40 Battery Acid and Engine Coolant Refractometer Fahrenheit black - Image 3](https://m.media-amazon.com/images/I/51HyCpLvMvL.jpg)

## Available Options

This product comes in different **Style** options.

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**Shop now:** [https://www.desertcart.hk/products/377673271-rf40-battery-acid-and-engine-coolant-refractometer-fahrenheit-black](https://www.desertcart.hk/products/377673271-rf40-battery-acid-and-engine-coolant-refractometer-fahrenheit-black)

---

*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-03-01*