Product specification:\r\nProduct Size: 10.8 x 1.8 x 1.4 inches\r\nMoisture range: 1-10 (1-3 dry, 4-7 normal, 8-10 wet) \r\nLight range: 0-2000 (0-500 dark, 500-1000 normal, 1000-2000 bright)\r\npH range: 3.5-8 (3.5-6.5 acidic, 7 neutral, 7-8 alkaline) \r\n \r\nNo battery or electricity needed, ready to use out of box, making gardening easier than ever.\r\nYou will know whatyour plant need when and why, your plants will be healthier.\r\nPortable for indoor/outdoor use, a necessity for anyone who gardens or has houseplants.\r\n \r\nHow to use:\r\nStep 1: Push the switch to the soil moisture/pH /light position.\r\nStep 2: Insert the probe into 2-4 inches of soil.\r\nStep 3: Adjust the position of the probe until the pointer on the dial slightly swings.\r\nStep 4: After 10 minutes, please pay attention to the soil moisture/pH /light levelin the dial.\r\nStep 5: After each use, remove the probe from the soil and wipe it clean.\r\n \r\nTips and Advice: \r\nDo not use it for testing very hard soil since it will be easy to damage the probe.If the soil is too dry and the indicator will not move, water it before testing. \r\nDo not use it for testing water or other liquids. Designed for testing soil. \r\nDo not leave the meter in the soil for a long time.\r\nAfter use, wipe the probe clean.