This is a simple, reliable and durable depth gauge that I use to set up buoys and markers on the lake. Don't worry about anything related to electronic devices.
Digital multimeter RGK DM-12
6 Review
π Dioxide Controller for Digital Gas Monitoring
5 Review
Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review
π¬οΈ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
8 Review