HiLetgo DC 6.5-100V 0-20A LCD Display Digital Ammeter Voltmeter Multimeter Current Voltage Power Energy Battery Monitor Amperage Meter Gauge with Built-in Shunt

The item came fast and well packaged, and it's bigger that I thought it would be (which is good as most of it is a display). The input and output is clearly marked on the back of the unit, as well as in the manual. There is a single button which is used to turn the backlight (it's blue by the way) on and off, as well as to reset the unit (as it keeps the energy counter even if turned off).I have tested in with voltages from 5 to 20 V and with currents from 0 to about 2A. Both the voltmeter and the ampermeter are quite precise, compared to other measurement tools I have and trust: the voltage is within 0.05V, and the current is within 0.001A as far as I can see. Measurements change every second or so, which is less frequent than your average multimeter.The screen is well readable from left, right, and down sides, but less so from the up side that is usually the case with liquid crystal displays, so take that into accounting when you mount it.One other remark is, the description says the lowest voltage is 6.5V, which is true except the backlight only comes in from about 7V, so I would say if you're going to need a backlight, consider the lowest voltage at say 7.5V to be on the safe side. Now, the upper limits are 100V and 20A as per description and documentation, unfortunately I don't have equipment to push the device to its limits.Finally, I have tested the alarm function and it works fine. You can set the two voltage thresholds (upper and lower), and if the voltage is not within the range specifies, both display and backlight flashes rapidly. This might come handy if say you need to prevent your lithium battery from discharging too much (i.e. undervoltage).I am giving it five stars overall, but especially for its precision.

I wanted something to accurately measure the amount of amps I was pulling from my inverter to run the lights in my greenhouse. I found this little meter to be very helpful and quite accurate. It at a great price. I bought my 1st one more than a year ago and it's still works perfectly on my other inverter. I found these meters to be a good item at a great price.

Works well in my homemade power station and tester. Plan on using your experience or intelligence to know how to work its features, as mine had no instructions how to set the backlight or anything. Just 1 button on the face to hold or push for settings, and I really don't know what the settings all are or how to navigate them by just 1 button and no instructions. Easy to wire up, the diagram is on back of the case, and a small screwdriver is only needed

This is a really nice meter. I purchased this hoping the display was big enough for clear and easy reading and I was not disappointed. I didn’t take the protective plastic off the display and was still impressed with the clarity.This meter would be best in a permanent location unless you install it in a box, which is what I might do. Make sure you read the product details so you know what you are buying. Wiring is pretty easy. Just make sure you have either the hot or neutral wire to the load going through the current transformer (CT).The backlight is not on a timer so it will stay on unless you set it to off. As it mentions in the description, it will remember if the setting for the backlight is on or off even if there is a power outage. The overload alarm function flashes the backlight on and off. There is no audio alarm feature as far as I know. If you have questions there is a lot of information on the web for this product.Over all this is a great product at a reasonable price. I would recommend this meter for the right application.

I have this hooked between the battery and load, a ham radio transceiver, to monitor the watt hours used and when it gets to about 50% usage (600 watt hours) I recharge the lithium iron battery. When charging I use it between the solar panels/charge controller and the battery to double check the charge state. Works great.