Sensing probe ensures accurate and instant testing results, matching for both indoor or outdoor use. Single probe, less hurts to the roots, doesn'for t dig up too much soil after test. Simply insert the meter into soil and you'll get the test result instantly. Help your grow and strong. Compact and portable, our meter No batteries or electricity needed. Large and clear including ten scales, plug and read., Weight: 0.14991433816 pounds, Manufacturer: Asukohu