This meter has passed the German TVU certification, and in accordance with the European ROHS environmental protection requirements Description: Material of pointer: Nickel silver strips Color of pointer : Black Pointer swing direction : from left to right Pointer Length:From the central axis to pin end 23±1 mm Pointer Width:0.45 ± 0.05 mm Using direction:perpendicular Electricity function Standard test conditions: temperature 20 ℃, humidity 70%, for the test results do not occur in the case of differences,can also be tested at room temperature and humidity. Current sensitivity: pointer to zero scale to maximum scale (full scale position) 1000 uA ± 10% Internal impedance:600 Ω ± 10% Instantly add full-scale current three times over-current, slowly reduced to the current sensitivity of 1/2 of the reading,at this point the pointer will return to the scale plate 1/3 scale range. Friction: add current to the meter,increase or decrease slowly to a certain value, error range of indication point ± 1mm Operating temperature limit -10 ° C to + 60 ° C RH 35 to 85% Storage temperature limit -20 ° C to + 60 ° C RH 35 to 85% Do not place the meter in direct sunlight, put meter in the box to avoid foreign matter into the meter inside. Bulb specifications:yellow LED 12V 20mA package: 1PC TN-42AWF VU Meter Amplifier Table DAC DB Power Sound Level Meter with Backlight