ITEM NAME:Digital PH Meter Tester Water LCD Monitor Aquarium Pen Type S2X4 Digital PH Meter Tester Water LCD Monitor Aquarium Pen Type S2X4 Measuring pH Range: 0.0 - 14.0 pH. Resolution: 0.1 pH. Size: 15.2cm x 2.8cm x 1.5cm. Case Size: 17.7cm x 6.8cm x 3cm Ideal for measuring the pH (acidity or alkalinity) of a liquid Size Name: Water Tester Brand New and High Quality. An ideal instrument for aquarium, fishing industry, swimming pool, school laboratory, food & beverage etc. Excellent meter, very acurate and durable. With protective plastic case and calibration screwdriver. Package Included: 1 x Digital PH Meter Tester 1 x Screw driver 3 x 1.5V Button Cell Batteries 1 x 4.00 Buffer Powder 1 x 6.86 Buffer Powder 1 x User Manual 1 x Protective Plastic Case Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.