The LCD meter can show you real time voltage/wattage with real vapor conditions. With traditional voltage meters, it only can show the voltage of the battery in a no-load condition, although it will not show you the drop of the voltage during real-time usage.
The benefit of testing with on-load condition with a quality battery is the voltage will remain as advertised during usage, as compared to a bad battery where the voltage will drop significant during usage.
Length x Diameter: 47mm x 22mm
Material: Plastic tube with stainless steel structure inside
Input voltage: 2.5V~6.5V
Testable wattage: ≤100W
Maximum current: ≤10A
Resistance range: 0.5~10Ω
Output voltage: 2.5~6.5V