HQ2100 Portable Multi-Meter with Rugged Field Conductivity Electrode-5 m Cable Whether you re using it for pH-conductivity-ORP-dissolved oxygen or total dissolved solids-the HQ2100 provides reliable accurate data every time Its IP67-rated rugged design ensures durability and performance for water quality testing anywhere your work takes you The HQ Series is a versatile family of water quality meters designed to meet a range of needs Each model offers the same trusted accuracy and durability while providing different features to suit specific applications The HQ4000 Series is the most advanced featuring three probe inputs and a larger full-color display for enhanced functionality and simultaneous measurements The HQ2000 Series is a mid-range option with two probe inputs For simpler needs the HQ1000 Series offers a single probe input delivering reliable performance in a streamlined design