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106246188
Extech RF20 Salinity Refractometer with ATC, PPT and Specific Gravity | Salinity 0-100 ppt and specific gravity 1.000-1.070, automatic temperature
88% of respondents would recommend this to a friend
Item #:
106246188
SAR 757
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What Stands Out
Automatic Temperature Compensation
Ensures accurate salinity measurements by automatically adjusting readings based on temperature changes, eliminating user guesswork and enhancing reliability in diverse environmental conditions.
User-Friendly Design
Designed for ease of use, this refractometer features a clear scale and simple operation, making it perfect for both novice and professional users in aquaculture and laboratory settings.
Versatile Applications
Ideal for various industries, including aquaculture, horticulture, and environmental monitoring, the RF20 addresses multiple user needs while delivering precise salinity measurements across different solutions.
Product Details
| Additional Features | High Accuracy |
| Display Type | Digital |
| Power Source | Battery Powered |
| Upper Temperature Range | 30 u00b0C |
| Response Time | 500 tmilliseconds |
| Reusability | Reusable |
| Indoor Outdoor Usage | Indoor, Outdoor |
| Resolution | 0.001 |
| Outer Material | Plastic |
| Product Care Instructions | Wipe Clean |
| Color | Blue/Black |
| Style Name | Salt (ATC) |
| Specification Met | ISO 9001 |
| Brand Name | Extech |
| Age Range Description | Adult |
| Included Components | Case, calibration screwdriver, calibration solution, guide |
| Model Name | RF20 |
| Model | RF20 |
| UPC | 793950222201 767654314678 |
| Global Trade Identification Number | 00793950222201 |
| Manufacturer | Extech |
| Part Number | RF20 |
| Item Length | 7.6 inches (19.3 cm) |
| Brand | Extech |
| Special Feature | High Accuracy |
| Age Range (Description) | Adult |
| Item Weight | 1 lbs (450 grams) |
Who Should Buy?
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Aquarium Keepers
Ideal for aquarists monitoring salinity levels to maintain optimal conditions for marine life in their tanks.
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Marine Biologists
Facilitates precise salinity measurements, aiding researchers analyzing water quality and aquatic ecosystem health.
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Hydroponic Farmers
Useful for growers managing nutrient solutions' salinity, ensuring healthy plant growth in hydroponic systems.
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Occasional Users
Not suitable for users needing occasional readings, as it requires regular calibration and specific usage knowledge.
Product Description
Extech RF20 Salinity Refractometer with ATC, PPT and Specific Gravity | Salinity 0-100 ppt and specific gravity 1.000-1.070, automatic temperature compensation, two-drop, case
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Customer Questions & Answers
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Question:
What is the Extech RF20 Automatic Temperature Compensation Salinity Refractometer used for?
Answer: The Extech RF20 is designed to measure the salinity of liquids, particularly useful for aquarists and marine biologists. This refractometer employs automatic temperature compensation, ensuring that readings remain accurate regardless of temperature variations. Whether you're monitoring seawater salinity in an aquarium or checking brine solutions for food processing, this device provides dependable results. Its compact design and robust construction make it an ideal tool for both professionals and hobbyists. -
Question:
How does the automatic temperature compensation feature work?
Answer: Automatic temperature compensation (ATC) in the Extech RF20 adjusts the salinity readings based on the liquid's temperature. This is crucial because salinity can vary with temperature, and accurate readings depend on maintaining consistent conditions. When using the device, the ATC function helps ensure that the refractometer provides precise salinity results, making it essential for applications in aquaculture and environmental monitoring where temperature fluctuations are common. -
Question:
Is the Extech RF20 easy to read and calibrate?
Answer: Yes, the Extech RF20 features a clear optical readout, allowing for straightforward interpretation of results. Calibrating the unit is simple and can be performed using distilled water to ensure accuracy. Users just need to adjust the scale according to the distilled water reading. This ease of use is particularly beneficial for newcomers to marine science or aquaponics, who may need a reliable tool without a steep learning curve. -
Question:
What is the measurement range of the Extech RF20?
Answer: The Extech RF20 measures salinity within a range of 0 to 100 ppt (parts per thousand). This extensive range makes it suitable for various applications, from saltwater aquariums, where salinity is typically around 35 ppt, to brining processes in food applications. Such versatility allows users to apply the device across multiple settings, making it an indispensable tool for both hobbyists and professionals alike. -
Question:
What type of liquid can be tested with the Extech RF20?
Answer: The Extech RF20 is specifically designed for testing saltwater solutions, such as marine environments, aquariums, and brine solutions. It's not advisable to use it for testing non-saline liquids as the refractometer operates on principles specific to saline solutions. For aquarists monitoring their salt levels or for chefs creating brined foods, this tool provides a reliable way to ensure optimal salinity levels for health and flavor. -
Question:
How do I clean and maintain the Extech RF20?
Answer: To clean the Extech RF20, users should rinse the prism with distilled water after each use to remove any residue from the liquid being tested. It’s essential to avoid using abrasive materials that could scratch the prism. Regular maintenance is key to ensuring accuracy; checking calibration often will help maintain consistent performance, especially in environments with varying salinity levels, such as aquariums. -
Question:
Can the Extech RF20 be used for freshwater applications?
Answer: While primarily designed for saline measurements, the Extech RF20 can be used indirectly for freshwater scenarios by observing changes in salinity. However, it is not optimal for freshwater testing as it lacks specificity for non-saline solutions. Users requiring accurate freshwater measurements might need alternative tools specifically designed for freshwater calibration. Nevertheless, understanding salinity variations can still complement freshwater management practices. -
Question:
What features make the Extech RF20 stand out from other refractometers?
Answer: The Extech RF20 stands out due to its automatic temperature compensation, ensuring accurate salinity readings across varied temperatures. Its built-in scale is highly readable, and its durable design is tailored for both fieldwork and laboratory use. The versatility and reliability of the Extech RF20 make it ideal for aquarists, environmentalists, and food technical experts, providing accurate results while being user-friendly. -
Question:
What is the best way to utilize the Extech RF20 in an aquarium setting?
Answer: In an aquarium setting, the Extech RF20 should be used regularly to monitor salinity levels, especially for saltwater systems. Regular checks are crucial for maintaining a healthy environment for marine life. Users can take readings at different times of day to understand how salinity may fluctuate due to evaporation or other factors. This proactive monitoring helps ensure that aquatic organisms remain in optimal conditions, promoting health and vitality. -
Question:
Where can I buy Extech RF20 Automatic Temperature Compensation Salinity Refractometer in Saudi Arabia?
Answer: You can purchase the Extech RF20 Automatic Temperature Compensation Salinity Refractometer on Ubuy. Ubuy offers a wide range of quality products and is recognized for providing a seamless online shopping experience tailored to customers in Saudi Arabia.
Extech Refractometers Editorial Review
Extech RF20 Salinity Refractometer with ATC, PPT and Specific Gravity offers high accuracy and a digital display, making it ideal for measuring salinity levels in aquariums. Users appreciate its easy calibration, which requires just distilled water and 10 seconds of time, and note that it provides accurate readings faster than traditional hydrometers. Many customers highlight how essential this tool is for maintaining healthy aquatic environments, as incorrect salinity levels can harm sensitive fish. Additionally, the included components like a calibration screwdriver and solution enhance its usability, showing that thought has been put into the product's design.
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Pros
- High accuracy for precise measurements
- Digital display is easy to read
- Quick calibration process with distilled water
- Includes calibration solution and screwdriver
- Lightweight and portable design
- Durable plastic outer material
Cons
- Instructions could be clearer for new users
Platform Trust & Buyer Confidence
E
Essam
Verified buyer
“Perfect service and fast delivery.”
16-Jul-26 · via Trustpilot
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Mohamed
Verified buyer
“We feel very good about the delivery time, and the materials we received matched our order.”
14-Jul-26 · via Trustpilot
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Anila
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“Good experience of shopping through Ubuy.”
16 June 2026 · via Trustpilot
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Farrah
Verified buyer
“A very big Thank you to HUDA and the Ubuy Team in helping to send my order to me yesterday!! Order # 62606425316 Customer service and operations is top for this online shopping company and I am very satisfied with the way they handle issues. THANK YOU once again!!”
25 June 2026 · via Trustpilot
MA
Mekki
Verified buyer
“Arrive before time, excellent products”
9 July 2026 · via Trustpilot
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Features & Benefits
- Quick response time for rapid measurements.
- Dual backlit display for easy visibility.
- Simultaneous readings for enhanced efficiency.
- Slim design with comfortable rubberized grips.
- Ideal for precise humidity and temperature analysis.
- Perfect for both professional and home use.
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