Lutron CD-4301 Electronic Conductivity Meter. : ? The portable conductivity meter provides fast, accurate readings, with digital readability and the convenience of a remote probe separately. ? Multi-measuring ranges: 199.9 uS, 1.999 mS, 19.99 mS. ? Used the durable, long-lasting components, including a strong, light weight ABS-plastic housing case. ? Large LCD display for low power consumption & clear read-out even in bright ambient light condition.? DATA HOLD function for stored the desired value on display. ? Display 18 mm (0.7") LCD, 3 1/2 digits., 3 1/2 digits, max. display 1999. ? Compact size, designed for easy carry out & operation. ? Wide applications: water contioning, aquariums, beverage, fish hatcheries, food processing, photography, laboratory, paper industry, plating industry, quality control, school & college, water conditioning.