Pentype Long Cable DO MeterFeatures a long cable for convenient measurement in various water environments.; Self-Floating Probe Ensures accurate readings by measuring dissolved oxygen specifically from water, not influenced by sand or other debris.; Accurate Dissolved Oxygen and Temperature Reading Provides precise measurements of dissolved oxygen in both percentage and mg/L, as well as temperature in °C/°F units.; Built-in Rechargeable Battery Equipped with a rechargeable battery that can be conveniently charged using a USB Type-C cable.; Switchable DO and Temperature Unit Allows users to switch between different units of measurement for dissolved oxygen and temperature.