Features: A pH and TDS (Total Dissolved Solids) Meter Combo is a practical device applied to measure and monitor water quality in various applications. With typically handheld and come with auto calibration, a digital display, and the ability to switch between pH and TDS measurement modes. Calibration with standard buffer solutions to accurate and reliable measurements. All round measurement of water quality to healthy water quality. Specifications: Product Name: pH and TDS meter combo Measurement Style: pH or TDS or EC or temperature Meter PH Meter Specifications: Measuring range: 0.00-14.00pH Accuracy: 0.1 pH Resolution: 0.01pH Operating Temperature: 0-60C(32F-140F) Power Supply: 2x1.5V (LR44 Button cell) Size: 155mm x 31mm x 18mm TDS Meter Specifications: TDS Measuring Range: 0 to 9999 ppm EC Measuring Range: 0 to 9999 s or cm Temperature: 0.1-80.0, 32.0F-176.0F Accuracy: 2 percent Size: 154mm x 30mm x 14mm Power Supply: 1 x 3.0V CR2032 Button cell Notes: The meter can't test sea water. Material: Metal colour: As shown Package Contents: 1 x pH meter 1 x TDS or EC or TEMP tester 12 x calibration solution powder 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.