This manual introduces how to use the Extech RF20 Handheld Salinity Refractometer
The Extech RF20 is a precision optical instrument designed to measure the refractive index of samples. It displays results in parts per thousand (0/00) and specific gravity (d 20/20) and features automatic temperature compensation for ambient temperatures between 50°F and 86°F (10°C to 30°C). The device includes a prism, cover plate, adjustment screw, mirror tube, and eyepiece for viewing the shadow-line.
| Scale Range | 0 to 100 0/00 |
|---|---|
| Resolution | 1 0/00 |
| Specific Gravity Range | 1.000 to 1.070 d 20/20 |
| Resolution | 0.001 d 20/20 |
| Dimensions | 7.6 x 1.5 x 1.5" (194 x 38 x 38mm) |
| Weight | Approx. 8.0 oz. (227g) |
The instrument automatically adjusts readings for ambient temperature variations between 50°F to 86°F (10°C to 30°C).
Place distilled water on the prism, close the cover plate, and rotate the adjusting screw until the shadow-line evens up with the zero line.
Extech warrants the instrument to be free of defects in parts and workmanship for one year from the date of shipment.