HOBO* Dissolved Oxygen Data Logger, Measure oxygen concentrations in lakes, streams, rivers, estuaries, and coastal waters, Oxygen Accuracy: +/-0.2 mg/L up to 8 mg/L, Temperature Accuracy: 0.2 Deg C, Depth Rating: 100 m
HOBO* Water Level Data Logger, low-cost, research-grade water level data logger for continuously measuring water level and temperature in a wide range of underwater environments, 0.1% measurement accuracy, Depths up to 13 feet
Go Direct* Wide-Range Temperature Probe, with Micro USB Cable, -20degC to 330degC Temperature, Temperature sensing element Platinum RTD (100 omega), Maximum temperature that the sensor can tolerate without damage 380degC, Dimension: 28x17 cm