YIERYI Professional 169E ORP/Redox Tester, Positive And Negative ORP Meter

1. Compact and portable pen-type design.2. Easy to use and provides instant display of results.3. Apply in water sources, aquarium, hydroponics, spas, swimming pools, and other water systems. Specifications :1. Measuring range:0~±1999mV2. Accuracy: ±5mV3. Resolution:1 mV4. Display:4-digital LCD5. Power Supply:4×1.5V(AG13) To transport security, shipments inChina do not include batteries6. Dimensions:188×35×35(mm)7. Weight:118gPacking List :1*ORP Tester(with plastic box)1*Screw driver3*1.5V battery（To transport security, shipments in China do not include batteries）1* Instruction manual