Optional Accessories
Coffee & Espresso Software for iPhone®, iPad®,
iPod Touch® or PC & Mac under Windows.
See: www.VSTAPPS.com - SOFTWARE
Please refer to www.VSTAPPS.com - Refractometer
ACCESSORIES for
Soft Case - soft silicone case available in multiple colors.
Hard Case - protects instrument during transit, keeps
temperature stable.
Reference Solutions - Accurate to +/- 0.02% for 1.40%
TDS and +/- 0.03% for 9.70% TDS, can be used to check
accuracy of the instrument at 20.0 +/- 2.0 Deg C.
Syringe Filter Kit - For pre-fi ltering espresso or coffee
brewed using metal fi lters
Transfer Pipettes - to transfer samples without
contamination to ensure accuracy
4
Temperature Correction
The VST LAB Coffee Refractometer is temperature corrected
for aqueous (water-based) coffee and espresso solutions.
Temperature correction does not mean that a hot coffee or
espresso sample can be placed directly into the sample well
which is at ambient temperature. Rather, it means that the
sample should fi rst be cooled to the temperature at which the
instrument was last calibrated, and that both the instrument
and sample are within the temperature correction range of 15
to 40 °C.
In order for temperature correction to work properly, a small
portion of the sample should be placed into a glass that has
been at ambient temperature and allowed 20-30 seconds to
cool before being transferred to the instrument sample well.
Once placed, allow 15-20 seconds for the sample to reach
temperature equilibrium with the instrument.
For the most accurate and repeatable results it is
recommended that the instrument, distilled water used to
calibrate the instrument, glass or ceramic cooling cups, and
the sample to be measured all be at the same temperature and
within the range of 15 to 40 °C.
Samples fi ltered with the VST COF/ESP syringe fi lters will yield
the most stable, repeatable results.
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