Main Features: Hold function: save measurements for convenient reading and recording Easy to use, remove the protective cap and immerse the pH meter electrode in the solution Lightweight, handheld design, convenience Laboratory pH testing, for aquariums, swimming pools, and tap water Automatic temperature compensation Range: 0.0-14pH Accuracy: + / -0.1pH Battery: 2 x 1.5V button cell ( not included ) Package weight: 0.114 kg Product Size(L x W x H): 14.50 x 3.00 x 1.50 cm / 5.71 x 1.18 x 0.59 inches Package Size(L x W x H): 16.50 x 5.00 x 3.00 cm / 6.5 x 1.97 x 1.18 inches Package Contents: 1 x pH Meter, 1 x Case