Details:Name: PH Meter Soil TesterMaterial: Plastic + MetalColor: As the picture Size?20 x 5 cm Introductions:1. Red area: you need to water your plant. 2. Green area: Everything is well. 3. Blue area: Need to reduce humidity. How To Use: - As far as possible to probe deeply into the earth and probe the upper portion for about 1 cm. - Number 7 means neutral value， When the number is smaller than 7， it means high acidity. - This tester is high sensitive and testing without prejudice， high accuracy and convenient to operate. - The light measurement range is 0-2000 lumens， the greater the value， the more LIGHT Note: When probe it into the earth，it can not run into a stone， not to damage the probe. Package: 1 * Humidity， light? PH tester