【PPM Value Range】A PPM value of 0-50 indicates ideal drinking water; a PPM value of 50-100 represents relatively ideal drinking water; a PPM value of 100-200 means acceptable drinking water; a PPM value of 300-400 indicates that scale will form; a PPM value of 400-500 means the water has an unpleasant taste; when the PPM value exceeds 500, the water is polluted and unfit for drinking. ·【Easy-to-Read LCD Display】With a large backlit screen, readings can be clearly viewed even in low-light conditions. The automatic locking function saves readings for convenient use, making it an excellent TDS water tester. ·【Reliable Accuracy】Our digital water quality tester combines a high-performance smart chip with a sturdy titanium probe to deliver fast and consistent results. It is perfect for use in swimming pools, aquariums, and with tap water. ·【4-in-1 Water Quality Tester】Can switch between TDS, EC, and °F/°C. Get instant and accurate readings for tap water, swimming pools, or hydroponics anytime, anywhere. ·【Durable and Reliable Design】The water tester features a tough ABS casing and a comfortable non-slip handle for easy operation. The advanced dual-core processor inside ensures fast and ultra-precise readings every time. ·【Instant Results】Ultra-fast 1-second reading.