The NEW Salt-Chek is a multi-scale pocket refractometer suitable for numerous industries including Food, Beverage, Agriculture, and Industrial. 3 measurement scales in one model allows more measurement flexibility and cost savings for you. Measure the concentration of Sodium Chloride (NaCI) from 0.0 to 25.8%, measure the Specific Gravity (SG) of Sodium Chloride (NaCI) from 1.000 to 1.197, and measure Sodium Chloride (NaCI) Parts per Thousand from 0 to 258 PPT. Other competitive designs require the purchase of more than one unit to match the measurement power of the Salt-Chek. Save time and money with this versatile, multi-use instrument. Simple 3 button operation - READ - SCALE - CAL allows for automatic measurements, quick scale measurement change, and easy water calibration.