Feature: Accurate Measurement: The current measurement accuracy can reach 0.001A, accurately measuring battery voltage, current, power, capacity value and other information.<br> Touch control: The screen can be locked to prevent accidental touch.<br> Brightness Setting:[AUTO] (automatic brightness) When the backlight brightness of the battery meter is in automatic brightness mode, the battery meter will automatically adjust the backlight brightness according to the ambient light.[FIXD] (Fixed Brightness)<br> When the backlight brightness of the power meter is in the fixed brightness mode, the backlight brightness of the power meter remains constant and is not affected by ambient light.<br> Bluetooth Settings: Bluetooth connection app for real-time viewing, user parameter APP operable settings.(This feature is only suitable for Android Bluetooth)<br> Widely Used: Products such as RVs, bed bikes, electric vehicles, emergency power supplies, energy storage power supplies, measuring equipment, medical equipment, various instruments and meters that can be used for battery equipment.<br> Basic parameters:<br> Working voltage:8.0~120.0V<br> Working Power dissipation (backlight off):3.4mA<br> Working Power consumption (brightest backlight):25mA<br> Sleep power consumption:0.3~0.7mA<br> Power off:0.4~0.5mA<br> Accurate voltage acquisition:±1.0%<br> Current acquisition accuracy:±1.0%<br> Accurate capacity acquisition:±1.0%<br> Capacity Detection Range:0.1~9999.0Ah<br> 50A sampler current:0~75A<br> 100A sampler current:0~150A<br> 350A sampler current:0~500A<br> Ambient temperature:-10~60℃<br> Color: As Shown<br> Material: PVC + Plastic + Metal<br> Package Contents:<br> 1 set x TX21 Bluetooth coulomb meters<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.