Found the model in the eyepiece (no box...):
RHS-10ATC
It was $40 at Premium:
http://premiumaquatics.com/store/me...de=PA&Product_Code=REFRACT-PA-K&Category_Code=
Looks like:
View attachment 9083
Specs:
Measuring Range:Salinity: 0-10%
Refractive Index: 1.000-1.070
Minimum Division: Salinity: 0.1%
Refractive Index: 0.001
(ATC) Temperature Compensation Range:10°C-30°C
Determines the amount of dissolved salt and dissolved solids
Approved by strict quality and safety standards
Durable and built to last long
Heavy-duty and lightweight with its aluminum construction
Easy to focus and calibrate
Accurate testing results guaranteed
Made with the highest and finest quality of aluminum & rubber that makes it lightweight
Cushioned with soft & comfortable non-slip rubber
Extremely easy-to-use and calibrate