Waterproof Extech Instruments ExStik ORP Meter
Patent Pending

High resolution of 1mV

• Measures ORP/Redox from -999 to 999mV
• Automatic electronic self calibration
• Simulated analog bargraph displays change in ORP reading
• Complete with flat surface ORP sample cup with cap, four SR44 button batteries, and 48" (1.2m) neckstrap