Parameter: Measuring range: AC voltage: AC 80-300V Yellow Current: AC 0-100.0A Blue ; Measurement accuracy: 1%; Measurement speed: 2 times / 1 second; Dimensions: 70 * 40 * 39mm (L * W * H). Screen viewing size: 48 × 24.5mm (L * W); Installation size: 68 * 38mm (embedded installation) (L * W); Note: This meter is only suitable for pure AC 50-60HZ power supply, can not be used for square wave, inverter output and modify the sine wave sine wave circuit measurement, otherwise the instrument will be permanently damaged! If you for any reason are not happy with any product supplied , please do not hesitate to contact us and we will do our best to solve your problem .