BOSS CT&E10 Coffee, Tea & Espresso (CT&E) Refractometer & TDS Meter

Twice the accuracy of our original BOSS CT&E refractometer!

Measures Coffee and Tea Strength with ±0.1% TDS Accuracy

Why spend hundreds of dollars on a digital coffee refractometer when you can get accurate, dependable brewing measurements at a fraction of the price?

The BOSS CT&E10 Coffee, Tea & Espresso Refractometer is an affordable, precision optical instrument designed to measure the concentration of dissolved solids in brewed coffee, espresso, tea, cold brew, and coffee concentrates.

Featuring two measurement scales, the CT&E10 provides both Brix and Total Dissolved Solids (TDS) readings, allowing coffee professionals, roasters, baristas, coffee shops, and home brewing enthusiasts to measure and reproduce their favorite recipes with greater consistency.

With ±0.1% TDS accuracy, this instrument offers an exceptionally affordable alternative to considerably more expensive digital coffee refractometers.

Whether you're dialing in a new espresso recipe, developing a cold brew concentrate, or monitoring the consistency of commercial coffee production, the BOSS CT&E10 helps take the guesswork out of brewing.

Why Use a Coffee Refractometer?

You grind your coffee. You weigh your grounds. You measure your water. You carefully control your brewing time and temperature.

But how do you know what's actually in your finished beverage?

Even when you follow the same recipe, small variations in grinding, extraction, water temperature, brewing time, and coffee freshness can affect the final result.

A coffee refractometer gives you an objective measurement of your finished beverage's dissolved solids concentration.

Instead of relying entirely on taste, you can measure your coffee's strength, record your results, adjust your brewing parameters, and work toward repeatable results.

The BOSS CT&E10 makes this process affordable and accessible.

What Is a Coffee TDS Meter?

TDS stands for Total Dissolved Solids.

When coffee or tea is brewed, water extracts soluble compounds from the grounds or leaves. These dissolved compounds contribute to the beverage's flavor, body, strength, and overall character.

A TDS measurement expresses the concentration of dissolved solids as a percentage.

For example:

• 1.0% TDS indicates a relatively low concentration of dissolved solids.

• 1.5% TDS indicates a stronger beverage.

• 2.0% TDS indicates a higher concentration.

• Higher readings are commonly encountered when measuring espresso and concentrated coffee products.

A coffee refractometer measures how light passes through a liquid sample and uses that optical measurement to determine its concentration.

Why does this matter?

TDS readings allow you to compare batches, evaluate brewing consistency, and calculate extraction yield when combined with the appropriate coffee dose and beverage mass measurements.

What Should My Coffee TDS Reading Be?

There isn't one universally correct TDS reading. The ideal concentration depends on the beverage, brewing method, recipe, and personal preference.

Here are some general examples:

These are general reference ranges, not mandatory brewing targets. Concentrates and specialty brewing recipes can fall outside these ranges.

The important thing is consistency. Once you establish the TDS level you enjoy, you can use your refractometer to reproduce it.

How to Use the BOSS CT&E10 Coffee Refractometer

Using the BOSS CT&E10 is straightforward. You don't need expensive laboratory equipment or specialized disposable filters.

Step 1 – Prepare your coffee sample

Brew your coffee, espresso, tea, or cold brew using your preferred recipe.

Step 2 – Filter the sample

For coffee measurements, filter a small sample through a clean coffee filter to remove suspended grounds and particles. Ordinary coffee filters work well for this purpose.

Step 3 – Allow the sample to cool

Allow the filtered sample to cool before taking your measurement. For a small sample of just a few drops, approximately 30 seconds may be sufficient, depending on its starting temperature.

Step 4 – Apply the sample

Place a few drops of the prepared beverage onto the clean refractometer prism.

Step 5 – Take your reading

Look through the eyepiece and point the instrument toward a suitable light source. You'll see a boundary line separating the blue and white fields.

Read the value where the boundary intersects the measurement scale.

Step 6 – Record and adjust

Record your Brix and TDS readings. Compare the results with your brewing recipe and make adjustments as necessary.

Will the BOSS CT&E10 Work With Coffee Brewing Apps?

Yes!

The BOSS CT&E10 provides TDS readings that can be entered into coffee brewing applications that accept manually entered TDS measurements.

This makes it useful for coffee enthusiasts and professionals who want to track brewing performance, calculate extraction yield, and document recipe adjustments.

You don't need a Bluetooth-enabled refractometer to benefit from the calculations offered by these applications.

Simply take your measurement and enter the result into your preferred brewing app.

Note: App compatibility refers to manual entry of TDS readings. The CT&E10 does not provide Bluetooth connectivity or automatic data transfer.

BOSS CT&E10 vs. Digital Coffee Refractometers

How does the BOSS CT&E10 compare with some of the better-known digital coffee refractometers?

One of the biggest advantages of the CT&E10 is its combination of affordability and measurement accuracy.

The following comparison uses the specifications provided for the respective instruments. Prices are historical/reference figures and should not be considered current verified retail pricing.

BOSS CT&E10

• TDS range: 0.0–8.4%

• TDS accuracy: ±0.1%

• TDS divisions: 0.1%

• Brix range: 0.0–10.0%

• Affordable optical design.

Atago PAL-Coffee

• TDS range: 0.00–22.00%

• TDS accuracy: ±0.15%

• TDS resolution: 0.01%

• Digital measurement and display.

HM Digital RCM-1000BT

• TDS range: 0.0–23.0%

• TDS accuracy: ±0.2%

• TDS resolution: 0.01%

• Digital instrument with Bluetooth functionality.

VST LAB Coffee-Espresso III

• TDS range: 0.00–20.00%

• TDS accuracy: ±0.03% from 0.00–4.99% TDS.

• TDS accuracy: ±0.05% from 5.00–20.00% TDS.

• TDS resolution: 0.01%.

The VST offers greater measurement precision, particularly for professional coffee analysis. However, it also occupies a considerably higher price category.

The bottom line: The BOSS CT&E10 is designed for buyers who want dependable coffee and tea concentration measurements without investing in an expensive digital instrument.

An important distinction: resolution and accuracy are not the same thing. A digital instrument displaying two decimal places isn't necessarily more accurate than an optical instrument displaying one decimal place.

BOSS CT&E10 Product Specifications

Calibration

The BOSS CT&E10 is calibrated using distilled water.

Calibration instructions are included with the instrument, and the supplied calibration screwdriver allows you to make adjustments when necessary.

For best results, keep the prism clean and follow the supplied calibration instructions.

Frequently Asked Questions

1. Can I use the BOSS CT&E10 for espresso?

Yes. The CT&E10 can measure espresso and other coffee beverages, provided the sample falls within its 0.0–8.4% TDS measurement range. Some traditional espresso preparations can exceed this range.

2. Can I measure cold brew coffee?

Absolutely. The CT&E10 is suitable for measuring ready-to-drink cold brew, as well as coffee concentrates that fall within its measurement range.

3. Can I use it for tea?

Yes. The instrument can measure brewed tea and other suitable beverages within its Brix and TDS ranges.

4. Does this refractometer require batteries?

No. This is an optical refractometer. It does not require batteries, electronic displays, or charging.

5. Can I use it with coffee extraction apps?

Yes. You can manually enter the TDS reading into coffee applications that accept TDS measurements.

6. Does it measure extraction yield?

The CT&E10 measures beverage TDS. To calculate extraction yield, you'll also need your coffee dose and beverage mass, along with the appropriate calculation or brewing application.

7. Do I need special coffee filters?

No. Ordinary coffee filters can be used to remove suspended particles before testing. A clean, properly filtered sample helps improve measurement consistency.

8. How do I calibrate the CT&E10?

Use distilled water and follow the calibration instructions supplied with the instrument. A calibration screwdriver is included.

9. Is this a digital refractometer?

No. The BOSS CT&E10 is an optical refractometer with a traditional eyepiece and visual measurement scale. It does not require batteries or electronic components.

10. Is the BOSS CT&E10 suitable for commercial coffee shops?

Yes. Its affordable price and dual Brix/TDS scales make it a practical option for coffee shops, small roasters, cold brew producers, and other businesses interested in monitoring beverage consistency.

YOU CAN BE THE BOSS WITH OUR REFRACTOMETERS!

Whether you're a professional barista, coffee roaster, cold brew producer, tea enthusiast, or someone who simply enjoys making a better cup of coffee, the BOSS CT&E10 gives you an affordable way to measure what you're brewing.

Stop guessing. Start measuring.

Order your BOSS CT&E10 Coffee, Tea & Espresso Refractometer from NI Supply today!

National Industrial Supply | NI Supply

NI Supply specializes in refractometers and precision measurement instruments for commercial, industrial, laboratory, food, beverage, and specialty applications.

We offer new, refurbished, and hard-to-find refractometers backed by knowledgeable product support.

Questions about this instrument or need help selecting the right refractometer? Contact us!

National Industrial Supply
30777 Rancho California Road #891420
Temecula, CA 92589
USA

Office: 310-748-6858
Email: nisupply@gmail.com
Website: www.nisupply.com