MAGNUM_MEDIA Automatic Temperature Compensation Sea Water Salinity Refractometer for Aquarium, 0%-10% (0-100ppt) & 1.000 to 1.070 S.G. DUAL SCALE Hydrometer MAGNUM MEDIA Dual Scale Salinity Refractometer - 0-100 Salinity ppt and 1.000-1.070 Salinity SG Economical Design - Soft Case Comes in a Soft Case with pipette, calibration screwdriver and users guide Perfect for the beginning Reef Tank hobbyist! 1 Year Warranty - through Magnum Media ONLY!