Features： 1、Very easy to operate, quick testing, obvious results. Simplest and cheapest way to test the water quality, see the condition of your drinking water 2、The electronic color tester is an effective tool that visually demonstrates the difference between high TDS water and low TDS water 3、Auto-off function. The meter shuts off automatically after 10 minutes of non-use to conserve batteries 4、Hold function. TDS tester saves measurements for convenient reading and recording. Large and easy-to-read LCD screen to display 5、Great to test the salt, metal or mineral in the water. Ideal tool set for drinking water, water filtration and purification, hydroponics, aquariums, pools and spas, and more Specification： A TDS meter is an inexpensive and convenient digital tool to instantly check your overall water quality. TDS means the Total Dissolved Solids, which is any salt, metal or mineral in the water. With the push of a button, the TDS tester can tell you your overall water purity level, which will be displayed on the LCD screen. The electronic color tester is an effective sales tool that visually demonstrates the difference between high TDS water and low TDS water. Very easy to operate, quick testing, obvious results. Simplest and cheapest way to test the water quality. Buy yourself the tool and see the condition of your drinking water. Features: Very easy to operate, quick testing, obvious results. Simplest and cheapest way to test the water quality, see the condition of your drinking water. The electronic color tester is an effective tool that visually demonstrates the difference between high TDS water and low TDS water. Auto-off function. The meter shuts off automatically after 10 minutes of non-use to conserve batteries. Hold function. TDS tester saves measurements for convenient reading and recording. Large and easy-to-read LCD screen to display. Great to test the salt, metal or mineral in the water. Ideal tool set for drinking water, water filtration and purification, hydroponics, aquariums, pools and spas, and more. Specification: Condition: 100% New Material: Plastic Battery: 2 * 1.5V LR44 button cell (not included) Measuring Range: 0-9999 Measuring Accuracy: 0.01 Resolution: 0.01 Test Pen Size: Approx. 15.6 * 3 * 1.6cm / 6.1 * 1.2 * 0.6inch Package Included: Approx. 245g Package Included: 1 * Water Quality Tester Set Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List：