This is Lily from SHANXI XIELI photo electric instrument CO, Ltd. We are a professional manufacturer of digital panel meter for 15 years. We have the 3 1/2, 4 1/2 and 5 digital Voltmeter, digital Ammeter, digital Power Meter, Digital Frequency meter, digital timer, digital counter and so on. We will send our price list after we receive your detailed inquire. Following is the detailed explation of 2 meters: XL5135 3 1/2 series:It have voltmeter and ammeter, can measure AC and ***** support DC5V, AC9V, AC110V, ***** feature of this kind of meter is :ultra-thin appearance with arc design, elaborate and elegant, more than 50, 000 hours longlife. Dimension: 79X42.5X25.5mm XL3600 3 1/2 series :It support DC5V and measure DC voltage and current. It is the super mini digital panel meter in our domestic.Dimension: 50X26X23.5mm.