1.Light weight and , easy to carry. With a hole for convenient hanging 2. screen displays the test on pH and chlorine level for easy and accurate reading, A convenient tool to test water pH and chlorine level for swimming pool and spa 3.Easy to operate, no more chemicals need, Made of premium plastic shell, durable and sturdy 4.Notice:it is not including the battery,when you use ,you should see the manual,and if it is the sea water,it cannot tester. Battery type: 1 x AA battery 1.5v (not included) Material: Plastic colour: As shown Package Contents: 1 x Water quality online analyzer 1 x Sandpaper Only the above package content, other products are not included. Note: Light reflection 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.