Three selectable operation modes for flexible testing POE mode, digital mode, and analog mode can be switched to fit different testing scenarios POE testing function for standard and nonstandard devices Tests standard and nonstandard POE devices Measures POE voltage Determines power supply polarity Identifies power supply mode Voltage test function for accurate readings Press V to enter the voltage test function Measures battery voltage and voltage polarity Press V again to switch to POE test mode In POE mode, measures POE power supply lines and voltages Adjustable sensitivity for reliable data If the received signal is strong, reduce the volume to prevent overload If the received signal is weak, increase the volume to capture accurate testing data Practical use scenarios Installations and upgrades: verify POE power delivery for IP cameras, wireless APs, and PoE switches, ensuring correct voltage and polarity before deployment mixed POE environments: test both standard and nonstandard POE devices to confirm compatibility and operating mode field diagnostics: switch between voltage and POE test modes to diagnose power delivery issues and confirm measurements onsite Key attributes at a glance Function: three modes (POE, digital, analog) with dedicated POE and voltage testing capabilities Compatibility: supports standard and nonstandard POE devices Performance: voltage, polarity, and mode measurements with adjustable sensitivity for accurate data Usability: intuitive V toggling between voltage and POE test modes for efficient testing Note: This description preserves the original functions and terminology, updated for clarity and readability without adding features.