What's in the box:

Aquarium Digital ORP Oxidation Reduction Potential Monitor Mini Online ORP Meter ORP Sensor Water Testing Equipment PH Tester for Water Monitoring & Analysis (Black)

Mini online ORP meter, suitable for continuous monitoring and display, used in aquariums, aquaculture, laboratories, chemical reactions, water treatment and more.

Features:
Compact ORP monitor designed for continuous monitoring.
Employ microprocessor technology, providing accurate readings and good performance.
Equipped with a LCD display, which makes it easy to read.
Powered by DC power source or button batteries, more convenient.
Mainly used in aquariums, aquaculture, laboratories, chemical reactions, waste water treatment, ponds and especially in fish tank.

Specifications:
Material: Plastic
Color: Black
Range: -1999~1999mV /-500~500mV
Resolution: 1mV
Accuracy: 5mV
Display: LCD, 4 digits
Operating Temperature: 0~50?
Power Supply: DC 6V or 4*1.5V Button Batteries(Not Included)
Plug Type: US plug
Item Size: 9.5 * 6 * 2cm / 3.74 * 2.36 * 0.78in
Item Weight: 114g / 4.02oz
Package Weight: 477g / 16.82oz
Package Size: 21 * 19 * 5.5cm / 8.26 * 7.48 * 2.16in

Packing List:
1 * ORP Meter
1 * ORP Probe
1 * DC Adapter
1 * Tools
1 * User Manual (English)