ULTRAPEN™ PT4 is Myron L® Company’s ground breaking, new Pocket Tester for measuring Free Chlorine Disinfecting Power, Free Chlorine Equivalent (FCE), as well as Temperature. It is waterproof and designed to be extremely accurate, fast, and simple to use in diverse water quality applications. ULTRAPEN™ PT4 Benefits: Reliable Repeatable Results Accurate Affordable Easy to Use Rugged Design Ensure Product Quality Reduce Waste Protect the Environment NEW! FCE TM Free Available Chlorine (FAC) Function The Myron L® Company FCE function reports FAC quickly and accurately by measuring ORP, the chemical characteristic of chlorine that directly reflects its effectivity, cross referenced with pH. Both DPD kits and colorimeters may tell the user the FAC value of the sample in the test tube, but since the chemistry of that sample is quite different from the source water being analyzed, the results are imprecisely related to actual disinfection power. The Myron L® Company FCE function measures the real, unaltered chemistry of source water, including moment-to-moment changes in that chemistry. ULTRAPEN™ PT4 High Performance Features: Accuracy of up to ±0.3 ppm FCE TM Calibration with pH and ORP Standard Solutions Automatic Temperature Compensation Live or Hold Mode – User Selectable Auto-Off Feature – User Adjustable Proprietary Sensor Design Easy to Use – One Button Control Rugged Design with Aircraft Aluminum Body Durable, Epoxy Encapsulated Electronics Waterproof Powered by One N Type Battery (Included) ULTRAPEN™ PT4 COMES WITH: PT4 Pocket Tester Pen – Battery Installed User Replaceable FCE TM Sensor – Installed Protective/Hydration Cap Scoop Pocket Clip ORP Electrode Cleaning Paper Quick Start Guide