HOBO* pH and Temperature Data Logger with Bluetooth Low Energy, Designed for long-term monitoring of pH in aquatic systems, can be deployed in both fresh and saltwater environments, Accuracy of +/-0.10 pH units within +/-10 DEG C of temperature
HOBO* 64K Pendant* Temperature/Alarm (Waterproof) Data Logger, one channel and is recommended for short-term shipping or long-term monitoring, Waterproof housing for wet or underwater use, 64K bytes memory, Data readout in less than 30 seconds
HOBO* Water Level Data Logger, stainless steel, No-vent-tube design for easy and reliable deployment, Ideal for recording water levels and temperatures in wells, streams, lakes, wetlands and tidal estuaries, 30-Foot Depth