This 4-in-1 soil moisture meter is designed to monitor import conditions that affect the health of plants. Test for sunlight, moisture, pH, and temperature levels all in one convenient hand-held device. The 8” long probe reaches root-deep into t soil. Overall dimensions of the meter are 13” long by 1.4” wide. Requires a 9V battery (not included) Technical Specifications: Sunlight Measurements: (LOW-)<500 Lux (LOW)500 to 5000 Lux (LOW+)5000 to 10,000 Lux (NOR-)10,000 to 25,000 Lux (NOR)25,000 to 60,000 Lux (NOR+)60,000 to 80,000 Lux (HGH-)80,000 to 100,000 Lux (HGH)100,000 to 120,000 Lux (HGH+)>120,000 Lux Moisture Measurements: (DRY+)<5% (DRY)5 to 10% (NOR)10 to 20% (WET)20 to 30% (WET+)>30% pH Measurements: Range: 3.5-9.0 (display resolution: 0.5) Soil Temperature Measurements:Range: -9℃ to +50℃ (16℉ to122℉) (display resolution: 1℃/1℉) Working Current: < 30mA Operating Temperature:+5℃ to +40℃ (41℉ to 104℉) Working Humidity: 5% to 95% RH non-condensing