The Solinst Model 102 Laser Marked Water Level Indicator which is designed to measure groundwater levels and draw down has features allowing it to pass into narrow diameter probes for use in wells as small as 3/8" (10 mm). The Solinst water level indicator is available with various lengths of laser marked cables.
Water Quality Sensors
The following Water Quality Sensors are available that fit your specifications. Please click on a sensor model name below to read more about that water sensor.