Check the listing for details. Extech Instruments Oyster PH/Conductivity + TDS Temperature Meter 341350-P. Condition: Used. Listed at 89.99 USD. This Extech Instruments Oyster PH/Conductivity + TDS Temperature Meter 341350-P is a reliable choice for businesses in need of accurate testing equipment. With a focus on quality, this meter is designed to measure pH, conductivity, and TDS levels with precision. Made by the renowned brand Oyster, this product ensures reliability and accuracy in your tests. This TDS meter is perfect for professionals in the field of water quality management, environmental monitoring, and industrial testing. It is made in Taiwan and has an easy-to-use interface that allows for hassle-free testing. Order yours today and get accurate and reliable testing results every time! See all pictures. They a re of the exact item you will receive.