DIVER groundwater level automatic monitor (Netherlands) Micro-Diver is the world's smallest automatic measurement, recording groundwater level and temperature instruments. It only palm size, length 90 mm, diameter 18 mm, very lightweight, can be used in almost any monitoring well. Micro-Diver integrated temperature and pressure sensors, memory and battery, externally sealed stainless steel (RVS 316L), which allows Micro-Diver wet or completely free from the influence of external current. Micro-Diver suspended by a steel cable in the monitoring well, and can read data on a regular basis, or install GPRS on-line monitoring system for dynamic real-time monitoring in the indoor data. Instrument automatically measure the groundwater temperature and water level, and stored in its memory, the memory can save 2 × 48,000 record data, which means that you measure once every 10 minutes, the memory can record up to 12 months of data. Battery life of 8-10 years. Micro-Diver is snappy and the perfect combination of durable and reliable. Two parameters (water level and water temperature) Item No. Measuring range DI601 10m DI602 20m DI605 50m DI610 100m Dimensions Diameter 18mm, length 90mm Weight 60g Housing material RVS316L ceramic material stainless steel pressure sensor sampling frequency 0.5s ~ 99h 2 × 48000 data memory, battery life Temperature range from 8 to 10 years -20 ℃ ~ 80 ℃ temperature accuracy of ± 0.1 ℃ Resolution 0.01 ℃ compensation range -10 ℃ ~ 40 ℃ 10,20,50 and 100m depth range of four selectable Accuracy ± 0.05% of full scale resolution 0.2,0.4,1 and 2cm (corresponding to four ranges)