Dwyer Instruments Inc., Michigan City, IN, offers the Models EC2-10, WSM-10, and TDS2-10 water testing pens. The pocket-sized testers can monitor conductivity, total dissolved solids, and salinity levels in streams, rivers, or other bodies of water. They have a durable ABS waterproof housing, automatic temperature compensation, can float if dropped, and have a large LCD that shows the conductivity, salinity, total dissolved solids, and temperature measurements. Batteries are included.
Dwyer Instruments Inc.