This is a Gecheer PH-3012B portable digital pH meter, featuring a white ABS plastic housing and a backlit LCD screen.It is designed for laboratory, aquarium, and water quality testing, with a measurement range of 0.00-14.00 pH and an accuracy of ±0.1pH.The device includes a separate electrode probe with a BNC connector and requires a DC 9V power supply to operate.It measures approximately 14 * 6.8 * 2.5cm and includes a mini screwdriver for calibration.