Digital pH Meter Water Quality Tester for Drinking Water Swimming Pool Aquarium Hydroponic 28TCCechs:Wide Application: Great for home and laboratory use; Water, pools, aquariums, spas, hydroponics, food, wine and beer production and much more. Fast and Reliable Reading: Highly accurate for measuring 0-14 PH range, 0.1 PH resolution, measuring and displaying pH results simultaneously with the LCD display, reliable and fast reading. Easy to use: Simply remove the protective cover and immerse the PH electrode in water and wait for 5 seconds. Damn trying to see the colors of the litmus bar. Pocket Size: Lightweight and easy to carry, it also comes with a carrying case that is easy to carry or store. Specifications:Measuring Range: 0.0-14.0PHresolution: 0.1 pHDaccuracy: ± 0.1ph (20°c), ± 0.22 pHTworking Temperature: 0-50°c (32-122°f)Calibration: Manual, 1 Point Adjustment: Trimmer potentiometer Battery: 5x1.5V LR44 button batteries (not included)Quantity: 1 setNote: Please allow 1-3mm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package Contents:1 x pH Meter1 x Calibration Screwdriver1 x Carrying Case2 x Calibration Buffer Solution Powder (pH 4.00 & pH 6.86)1 x User Manual