Three in one, easy to use probe to check for optimum growing conditions for house or garden plants. The PH meter checks the balance of your soil, the moisture meter will read the water content nearest the roots & the light meter will allow for the correct positioning of your plant. No batteries required, simply unpack & go. Measures approx 25cm long x 6cm wide. Boxed. Nutley’s Moisture Ph & Light Meter Probe House Garden Plants No Batteries Needed