Features: Achieve precise measurements with our 4-in-1 TDS testing pen, perfect for ensuring water purityand safety. Madefrom durable plastic, this testing pen is designed to withstandrepeated use and provide accurate results. Whether you're a homeowner, gardener, or aquarium enthusiasts, our TDS testing pen is essential for monitoring water quality. Use our testing pen to check the quality of tap water, pool water, hydroponic solution, and more. Easy to use and provides quick results. Investin the peace of mind that comes with knowing water is safe with our reliable and convenient TDS testing pen. Specifications: Material: Plastic Range: TDS: 1-9999ppm±2% EC: 1-9999μS/cm±2% PH: 0-14PH±0.05 Battery: 2x1.5V Batteries(Included) Working Temperature: 0-60℃(32-140℉) Size: Approx. 15.5x2.9x1.4cm/6.10x1.14x0.55in Package Includes: 1x WaterAnalyzer note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. The batteries included are for testing productperformance, do NOT guaranteetheir service life