Check the listing for details. 4 in 1 LCD Digital PH Tester Soil Water Moisture Light Temperature Test Meter. Color: Black + Orange, Condition: New. Listed at 11.75 USD. 4 In 1 LCD Digital Soil Tester PH Water Moisture Temperature Sunlight Plant Test If there is a problem with the product, please contact the customer service staff immediately and tell the reason why it cannot work. The customer service will contact the manufacturer to provide a solution after receiving the problem. Please wait patiently and do not easily disassemble the product to prevent secondary damage. Precautions:1. The foam in the package is a protective measure to fix the probe.2. When removing the foam, please remove the probe silicone cap first to prevent the foam hole from being stuck，cause the probe to be ripped off.3. When removing the foam, hold the foam with one hand and the probe with the other to slowly pull out the foam. (Never hold the monitor to prevent damage to the probe)4. If you encounter problems, please contact us in time, we will solve the problem for you as soon as possible, I wish you a happy life!