PH measurement range: 3-8 PH, accuracy: 0.3 PH. The pH meter can tell you the PH value. The optimal working temperature range for PH is 5 to 50 C (41 to 122 F). Equipped with reliable waterproof metal electrodes, it can quickly and accurately measure pH and humidity levels, as well as pH and humidity values of different soils. It is self powered and does not require batteries. Very suitable for vineyards, orchards, field production, caregivers, lawn care, gardens, fast pH and planting humidity reference. Sensitive probes can sense changes in soil and transmit details to conductors, thereby measuring accurate pH values for you. If you have any questions about us, please feel free to contact us and let us know how to do better. We will provide the best after-sales service.