The Mettler Toledo InLab Expert Go-ISM pH Electrode 51344102 Lab Meter Probe is a high-quality lab meter probe designed for precise measurements in a variety of scientific and industrial applications. Made by the reputable brand Mettler Toledo in the United States, this product features a durable construction and accurate readings. With two units included in the package, this pH electrode is ideal for professionals seeking reliable and top-notch lab equipment to ensure accurate results in their research or testing procedures.