1. Shell material is thick and sturdy, durable2. Mini size, will not take up too much space, easy to carry3. Efficient and stable performance, safe and reliable4. Digital AC voltmeter with dustproof base helps to reduce the dust into the prolonged service life5. No wiring design, simple operation, easy to useParameters:1. Voltage range: AC50-380V2. Frequency: 50-60Hz3. Working temperature: -25-55 degree celsius4. Measurement error: 2 percent5. Mechanical life: 1 million times6. Electrical life: 500,000 times7. Operating frequency voltage: 2.5kV (AC RMS)8. Size: 34 x 34 x 55mmSpecification: Package Weight One Package Weight 0.03kgs / 0.07lb One Package Size 4cm * 4cm * 6cm / 1.57inch * 1.57inch * 2.36inch Qty per Carton 540 Carton Weight 17.30kgs / 38.14lb Carton Size 50cm * 38cm * 32cm / 19.69inch * 14.96inch * 12.6inch Loading Container 20GP: 438 cartons * 540 pcs = 236520 pcs 40HQ: 1018 cartons * 540 pcs = 549720 pcs