Please note: This is a Sole Source Notification. These items will help MWRRI meet the requirements of a current and relevant USDA-NRCS project with the goal of recirculating irrigation tailwater in rice production fields and continuously measuring soil redox potential and pH across multiple states. They are the only solar powered data logger and connection module setup to continuously monitor soil redox potential and pH that can meet project requirements. Commodity or commodities to be purchased (make, model, description): 10 Watt solar powered (2021/10) Data logger “enviLog Midi” radio transmission, 12V (22013) and Connection module for Redox and pH electrodes (4611) plus Software Wireless for Datalogger enviLog (220233) and Radio receiver for PC/Notebook (220227) with Outdoor covering case 400 x 600 (2174/46) and Mast clamps (2174/MB) for continuous measurements of soil redox potential and pH using Redox electrodes according to Mansfeldt (461/30), pH electrodes (465) with Sensor protection sleeves (465H), and Ag/AgCl-Reference for field studies (4621). Including pre-shipment Laboratory set-up and function test – Data logger system (9016) and System documentation (9015).