VST LAB Coffee III Refractometer

Sale priceA$1,399.00

Same day dispatchOrders placed before 3pm

Same day dispatchOrders placed before 3pm

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The VST LAB Coffee III Refractometer is a tool that has been used for measuring coffee & espresso Total Dissolved Solids (TDS) to understand the efficiency and quality of brewing through extraction. 

VST Labs have advanced the Refractometer with the latest fourth-generation that provides laboratory precision that comfortably fits into the palm of your hand. The Lab III Refractometer has an expected accuracy of +/- 0.02% and worst case precision of +/- 0.1%.

Designed for the rapid and accurate calculation of coffee concentration within a sample, an automatic temperature compensation has been programmed to automatically correct for temperature within the range of 15-40cº. 

Advanced Sapphire Optics backed by a 1024 Element Detector Array boost precision and improve accuracy to +/- 0.03% in the Filter coffee sample range and +/- 0.05% in espresso sample range. The super fast reading will automatically average multiple measurements and than display the resulting TDS as a decimal reading, easily converted to a percentage out of 100%.

Using the built-in Auto ranging TDS Scale you can explore and understand the nuances of flavour vs strength vs extraction and begin to catalogue effective ways to make better tasting coffee.

An ambient light shield and evaporative cover protect the stainless steel sample well and optics. Intended for use in commercial settings, the VST Lab Refractometer adopts a durable rugged rubber armour jacket to sustain the tough cafe and kitchen environment. 

With the added option of VST CoffeeTools Software, (Window or MacOS) you'll gain access to further tools to be used alongside the VST LAB Coffee III Refractometer  to calculate the extraction yield and other variables.

VST LAB Coffee III Refractometer  FEATURES

TDS Analysis – Discover the extraction yield of brewed coffee using Light Refraction.

Sapphire Optics – With extreme surface hardness and scratch resistance.

Multiple Measurements – Averaging out the TDS over several samples taken.

Auto-Ranging – From Filtered Coffee to Espresso range of 0.00-20.00%

Temperature Stable – Automatic Temperature Compensation provides accurate results regardless of surrounds.

Smart Zero Set – Using distilled water ensures precision and accuracy of reading.

Durable Cover – It will protect the Refractometer in harsh environments.


  • VST LAB Coffee III Refractometer


Coffee Espresso Coffee & Espresso
Unit of Measurement % TDS
Range 0.00 - 9.99 0.00 - 20.0 0.00 - 20.00
Resolution 0.01% 0.1% 0.1%
Precision +/- 0.02% +/- 0.1% +/- 0.03%
Accuracy +/- 0.05% +/- 0.1% 0.00 - 4.99 – +/- 0.05%

5.00-20.00% – +/- 0.10%

Prism Material Sapphire
Well Material Stainless Steel
Detector 1024 Elements
Temperature Range 15 to 40ºc
Sample Volume 0.3ml
Measuring Time <2 Seconds
Power 2 x AAA Batteries
Battery Life >4,000 Readings
Dimensions (mm) (L) 145 x (W) 75 x (D) 37
Weight 250g

Note: This is just the refractometer. Included software is available to gain access to further calculations of extraction yield and other results. The VST LAB Coffee III Refractometer only, measures % TDS.


Available Styles

  • With Software - VST LAB Coffee III Refractometer
  • Without Software - VST LAB Coffee III Refractometer

Check out how to use the VST LAB Coffee III Refractometer in the Video Below:

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Alternative Brewing Shipping Times

* Rural and remote areas may attract longer shipping times but we make every effort to ensure we provide the fastest delivery times possible.

* Please note bulky/heavy orders to rural, remote & offshore areas may attract additional delivery fees.

Orders placed before 3pm AEST each day will be dispatched on the same day, Monday to Friday, excluding public holidays and weekends.

Delivery times above are estimates only. Delivery times apply from the date of dispatch, not the date orders are received and refer to business days not calendar days. We make every attempt to ensure all deliveries arrive within the estimated time frames above however sometimes events occur that are out of our control. If your order is more than 2 business days late based on the above guidelines please contact us and provide your name, order number and date of order.

International Shipping Terms and Conditions – Customs & Duty Charges

International orders may be subject to local charges. Any customs or import duties and associated fees are charged once the parcel reaches its destination country. These charges must be paid by the recipient of the parcel. We have no control over these charges and cannot predict what they may be. Alternative Brewing cannot be held responsible for any additional charges on your order, nor can we accept a return of the order in this case. Customs policies vary widely from country to country, so please contact your local customs office for further information. If you refuse to pay these charges your parcel may be abandoned, and Alternative Brewing will not be held responsible for any loss of funds as a result of this occurrence. We cannot mark International orders as a gift in order to bypass or reduce any customs fees.

Authority to Leave Terms and Conditions 

By ticking the Authority to Leave box at the checkout page on the website when placing an order, Alternative Brewing’s agent/delivery partner will leave your parcel at your unattended premises in accordance with your instructions.

By providing Authority to Leave you agree that the parcel is deemed to have been received when left at your premises.

Alternative Brewing, and its agents/delivery partners associated with the delivery of your parcel, do not accept responsibility for any loss or damage that may result from you providing Authority to Leave for your delivery. You agree to release Alternative Brewing from and against any and all claims, demands, liabilities, losses, costs and expenses, including financial and other consequential losses, made, suffered or incurred by you or any other person or entity as a result of your election to choose Authority to Leave for your delivery.

If you do not provide Alternative Brewing Authority to Leave for your delivery, you will have to be at your premises in order for the delivery to occur.

Freight Protection 

We strive to ensure that your delivery arrives safely to you, but we understand that sometimes accidents happen outside of our control.  

By selecting Alternative Brewing's Freight Protection you will receive a priority customer support and priority replacement of your product if it arrives damaged. You will be able to add this option to your order in checkout. 

What does Freight Protection offer?

1 - Priority Customer Service – as soon as you contact our team to submit your Freight Protection claim, you will be placed into a priority queue to ensure your claim is processed as quickly as possible.

2 - Advanced Shipping – to minimise downtime without your product, once we have assessed your claim we will ship a replacement to you before we have received the damaged goods back.

Making a Freight Protection Claim

  • To assess your claim, you will be required to provide photo and/or video evidence of the damaged product. 
  • All Freight Protections claims must be made within 3 business days of receiving your product.
  • Freight Protection does not apply to damaged packaging and only applies to the product itself.
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