Product features • Great for all home and laboratory pH testing applications including aquariums, swimming pools • Measurement range of 0-14 pH - highly accurate, reliable and quick readings • Comes with carrying case; Lightweight, handheld design for portability and convenience Large Back lite •  This THZY pH tester is the perfect device for determining the acidity or alkalinity of liquids. Each unit comes with a carrying case and small screwdriver for precise calibration; furthermore, It is easy to use - simply remove the protective cap and immerse the electrode in the solution to be measured. Included with the meter are 6.86 and 4.01 pH buffers for an initial calibration - Instructions for calibration are also included with this product. 
 (R3,ZS) 4.8oz