The voltmeter has high precision and high reliability, you can use it safely.It can endure 1min withstand voltage test of a sine wave with a frequency of 50Hz and an AC voltage of 2kv for 1min.There are three colors for the scale.(White Background, Black Word, and Red Pointer)The embedded installation is easy to wire.It& 39;s suitable for the power equipment and measuring the electric current directly.Item Name: DC Pointer VoltmeterMaterial: PlasticStorage Temperature: -40~70 Degree CelsiusAccuracy Grade: ±2.5%Insulation Resistance: >20MΩ/DC500VDamping Time: Less Than 4sWorking Environment: Temperature: -20~40 Degree Celsius, Relative Humidity: ≤85%Type: 20 (DC0-20V) 30 (DC0-30V) 50 (DC0-50V) 100 (DC0-100V) 200 (DC0-200V) 300 (DC0-300V) 450 (DC0-450V) 500 (DC0-500V)Features: High Precision, Pointer DC Type, Easy OperationSize: 6.3cm x 6cm x 5.5cm/2.48" x 2.36" x 2.17" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x DC Pointer Voltmeter