The Sure Test� Commercial Multi-Meter allows for easy measurement of pH and conductivity (EC or TDS) and temperature (�F or �C) in one versatile unit. It also has the ability to measure dissolved oxygen (DO) with the optional DO probe (#716388, sold separately) making it the most versatile handheld multi-meter available. This rugged meter includes automatic temperature compensation (ATC) for more precise pH readings. Easy-to-use and calibrate, this meter is an excellent choice for all-in-one nutrient management anywhere you take it. Comes with replaceable conductivity probe (#716382), replaceable pH probe (#716386), hard carrying/storage case and 6x AAA batteries. Waterproof housing (IP65 rated).