Backlit LCD Display, Clear readings even in low-light conditions. Dual pH/mV Measurement, One-touch switching between pH and mV modes for flexible testing. Portable and Lightweight Design, Suitable for fieldwork, laboratory, or on-site testing. High Precision and Stability, Provides reliable data with ±0.01 pH accuracy. Applications: Widely used in light industry, chemical engineering, pharmaceuticals, food safety, epidemic prevention, environmental protection, and educational or scientific research for electrochemical analysis. Power Supply:Uses 4 x AAA batteries.(Not included batteries) Measurement Ranges: pH: 0.0-14.0 mV: ±1999mV Dimensions / Weight:300x265x135 mm / 1.1 kg Operating Environment:0-40℃ Accuracy:pH: ±0.01/Temp: ±1℃ Temperature Range:0-100℃ mV Measuring Range:±1999 mV pH Measuring Range:0.00-14.00 pH Specification: PHB-1:Without temperature electrode, supports manual compensation (0-80℃). / PHB-4:Comes with temperature electrode, supports manual/automatic compensation (0-80℃). Color:As shown Material:plastic Package Contents: 1 * Handheld pH Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.