TRUE NATURAL Salinity Refractometer; Reef Aquarium, w/ Lighted Daylight Plate

 THE REEF SEA METER with Lighted Daylight Plate   NATURAL SEA WATER REFRACTOMETER Specifically designed for aquarium use for measuring the salinity of Natural Sea Water (NSW) Dual Scale Specifications: Range:                                          Minimum Division:       Accuracy:                  Light Source: 0-40 PPT of Salinity in NSW         1.00 PPT                        +/- 1.00 PPT               Ambient: Sunlight or Lamp 1.015 to 1.030 Specific Gravity     0.001 SG                        +/- 0.001 SG   AUTO TEMPERATURE COMPENSATION (ATC): 50-86'F/10-30'C Almost all hand held salt water refractometers available to the hobby are designed and calibrated for the testing of brine solutions, i.e. sodium chloride, and are not calibrated for the refractive index of Natural Sea Water.  This is a very important distinction.  Other Salinity Refractometers used for marine aquariums are designed to test salt in water – nothing else!  The Reef Sea Meter is designed to measure Salinit