Super Debug 5V-30V Delay Relay Timer Module Trigger Delay Switch Micro USB Power Adjustable Relay Module Electronic Components Electronic Hobby Kit

Operating voltage: Dc 4 - 30v. Measure voltage: Dc 0 - 100v. Measure current: 1a-50a ( need external shunt, included here) note?It is unsuitable to use this meter to test current less than 1a,if you use it to test ampere below 1a,it will have big error. Minimum resolution (v): 0.1v. Refresh rate: ?500ms / times. Measure accuracy: 1 percent (1 digit). Minimum resolution (a): 0.01a. Operating current: <20ma operating temperature: -10 to 65 degree celsius. Operating humidity: 10 to 80 percent (non-condensing). Mounting cutout: 46mm x 27mm.