Saltwater Meter Salinity Meter Digital Water Tester Hydrometer Ideal for Hydroponics Aquarium Fish Pond Aquaculture High Accuracy Pen Type Meter Specific Gravity(SG) Salinity and Temperature 3 in 1 auspowers_batchtwo but can also make it June2023_cocoonwix but can also make it easier to watch videos and play games 360 Degree Rotation Lovely shape +360 Degree Metal Rotating ring kickstand can hold your Cell Phones and Tablets fits on flat surfaces such as cellphones and tablets with hands free so we set Automatic Temperature Compensation (ATC) function for reading always be accurate at various temperatures Battery Compartment Use batteries instead of charging