A choice of 28cm and/or 40cm MITT Soil Moisture Meter.
 
How to use:
Insert the metal probe into the soil until it meets resistance. If resistance occurs, try another spot without forcing the probe.
Recommend to test on different areas of the soil to ensure consistency.
Interpret the results based on your plant's needs. Remember, the moisture meter indicates soil moisture but doesn't determine when to water. Know your plant's specific requirements.
After use, remove the moisture meter from the soil, wipe it with a dry cloth, and store it in a dry place. Do not dip the meter into water, as it will spoil the sensitive probe. Avoid leaving it in the soil.