Extech RF20 Operating Manual
User's Guide
Portable Salinity Refractometer with ATC
Model RF20
Introduction
Congratulations on your purchase of the Extech RF20 Handheld Salinity Refractometer
with Automatic Temperature Compensation. This precision optical instrument should be
handled gently; avoid touching the optical surface. Careful use of this instrument will
provide years of reliable service.
Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and
workmanship for one year from date of shipment (a six month limited warranty applies on sensors and
cables). If it should become necessary to return the instrument for service during or beyond the warranty
period, contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our
website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’ to request an RA
number). A Return Authorization (RA) number must be issued before any product is returned to Extech. The
sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in
transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper
wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification.
Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and
will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited
to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty,
whether written or oral, is expressed or implied.
Specifications
Scale Range Resolution
Parts Per Thousand 0 to 100 0/00 1
Specific Gravity 1.000 to 1.070 d20/
Dimensions 7.6 x 1.5 x 1.5" (194 x 38 x 38mm)
Weight Approx. 8.0 oz. (227g)
0.001 d
20
0
/00
20
/
20
Description
1. Prism
2. Cover Plate
3. Adjustment Screw
4. Mirror Tube
5. Eyepiece
1 2 3 4 5
2
RF20 Version 1.1 September 2003
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