I have that multi-meter, I just use it for voltage testing and continuity test. My unit was not calibrated correctly at first. Everything is over the expected voltage. Example a new 1.5 alkaline battery would measure about 2.0 volts.

If you open the case, there is an adjustment screw in the back to calibrate it to get a better reading. I would not say accurate but pretty close.

I almost bought their temp guns too for 20$, but found out that the range is not as wide as Duratrax flash point, so for 5$ more I settled for the flash point.