Usage Tips:FEATURES: It is a multi-functional water quality pen that can measure ph, EC, salinity, and temperature. It comes with a high-performance pen design with fast numerical stability and accurate calculation results. It has a lightweight and portable design, convenient for indoor and outdoor use. It is made out of quality material, highly efficient, and accurate. It is equipped with a large and clear display screen, easy to read the displayed value with an automatic temperature compensation function. It is applicable for gardens, homes, laboratories, farms, aquariums, etc. SPECIFICATIONS: Color: White and Blue Material: ABS Size: 37 x 183 mm Weight: 90g Function: pH Tester Battery: 3 x LR44 button batteries (Not included) Accuracy: up to 0.05 pH pH measurement range: 0.01-14.00 pH TDS measurement range: 0-1000 ppm EC measurement range: 0-10000 US/cm Salinometer measurement range: 0.00-25.00%. Temperature measurement range: 10-140 PACKAGE INCLUDES: 1 x pH Tester