Does this measure mili amps?

The short answer is "Yes". This meter has what is known as a 3-1/2 digit display, in other words, its maximum display reading is 1999. The lowest current range, both AC and DC is 2A, so the maximum reading is 1.999A. On this scale therefore the meter has a resolution of 1mA, so it can read currents up to 2A with resolution of +/- 1mA. Note the "+/-", as with all digital instruments there is an uncertainty in the least significant digit of +/-1 due to quantisation or sampling errors, this is perfectly normal, and applies to all digital systems. In order to make the most accurate low current measurements when you select the DC current mode, place the meter as close to the measurement position as possible, and zero it with a brief push of the ZERO button, and then clip the meter's jaws over the wire carrying the current to be measured.

Does it come with a calibration certificate

No, I have been in the electronics industry for over 35 years and if your occupation requires a calibrated instrument you will have to go down the route of Fluke instrumentation. Yes, these are 10x the price of your average meter but can be sent away for calibration yearly as a compulsory requirement of the vast majority of industries. Since leaving the industry I no longer have the need for calibration and have been more than happy with UNI-T as a daily workhorse.

can i test earth leakage with that

provided you can get the clamp around the wire carrying this current this should be OKs. However if the current is going to earth through an alternative path you will not get a useful answer. You could try putting the clamp around the line and neutral (exclude any earth wire) this should indicate leakage (differential) current but I have not tried this.

Just bought this meter. 2300w heat gun on 230v ac reading zero amps???? am i doing something wrong or is this just useless?

Although you do not say so, I suspect that you are simply clamping the ammeter over the mains cable. In which case, it will read zero. The alternating current creates a magnetic field around each wire, and as the two wires in the cable are in close proximity to each other, their individual magnetic fields cancel each other out. What you need to do is make yourself a piece of wood with a mains socket on it and wire up a mains plug, but keep the live (Brown) and neutral (Blue) wires separated. Plug the mains plug into the mains, plug your appliance into the socket and now clip the ammeter over either the live (Brown) or the neutral (Blue) wire, and this way you will sense the current in one wire only, and the ammeter will show the result. You should also connect the earth (Yellow/Green) wire to the socket as well, for safety. I am assuming that you have correctly selected the AC current range, which, for the load you have indicated would be the 20A range. When you wish to measure Direct Current, select the appropriate current range, and then holding the clamp near where you wish to make the measurement, briefly press the grey ZERO button to cancel any residual reading, and then open the clamp and clip it over a single wire carrying the current to be measured. When making a DC measurement it is important to zero the meter as close to the measurement location as possible, as it is sensitive to the Earth's magnetic field.

Manufacturer	UNI-TREND TECHNOLOGY (CHINA) CO., LTD
Part number	B4Q094
Item Weight	170 g
Product Dimensions	17.5 x 3.35 x 5.99 cm; 170 g
Batteries	2 A batteries required.
Item model number	UT210E
Size	UT210E
Colour	UT210E
Style	Compact
Material	ABS
Power source type	Battery Powered
Item Package Quantity	1
Specification met	CE, IEC 61010-1:2000-1
Included components	Batteries, test leads (UT210C/UT210D/UT210E), point contact temperature probe
Batteries included?	No
Batteries Required?	No
Battery Cell Type	Alkaline

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