Marine Digital Corrosion Professional Tester with Silver & Silver Chloride Reference Cell (SSC)The corrosion protection system on your boat should be checked at regular intervals. Failure to do so can lead to a costly and time consuming repair. Seaguard Digital Corrosion Tester is designed to be used by boat owners or marine operators.Features:Quick response timeColor test resultEasy to use and customizeChoose between a Standard and PRO modelQuick release lock connectors for both the reference cell and the alligator clip - you will never lose them!Specifications:Measurement Range: -2.5V +2.5VAccuracy: 0.5%AD Resolution: 16 bitsDisplay Refresh Rate: 5 time/SecDisplay: 1.8" TFT, Resolution: 320*220Power Supply: 3 pcs AAA batteriesBattery Lifetime: 7 hoursAuto Shutdown: Auto off after 2.5 minutesRecord Data (PRO Model): Max.50