This isn't going to be much of a review but I thought people might appreciate another meter teardown. This time it's a cheapie, the Innova 3320. By cheapie I mean $20 from Amazon.
First, on the outside:
The meter is quite small. I think it looks bigger in pictures. The controls are very basic... just that knob in the center. The large display is quite easy to read though the contrast isn't the best, just decent. I like the clips for the leads as well as the strap on the back which lets you strap the meter to your wrist when working in tight areas or with both hands (I wouldn't try that where power and safety is a concern).
The auto ranging is reasonably quick though not really fast. The continuity check is on the slow end of things. Accuracy specs seem OK for a cheap meter. (1%+5 counts DC). The under load battery check is nice though I don't know how much I would ever use it. Battery replacement is poor as you have to remove the back half of the meter. The screws of course are self tapping thus you have to be careful to avoid cross threading.
The probes are quite cheap feeling. The tips aren't that sharp and the main part of the barrel doesn't seem to make good contact. The 10 A range is unfused. The box is rather funny. They show someone taking a voltage measurement with the positive lead in the 10A range. The measurement in the picture is of an AC outlet! Good thing the picture was staged! A 15A, 120V line might hurt someone...
So what about the inside? Cheap again. A single fuse for the shared voltage/current input. The 10A is unfused. The meter claims Cat 2 but with no fuse on the 10A I don't know if that is really OK. I certainly doubt the glass fuse is rated to 600V. A single PTC seems to handle an over voltage condition. It does have a few isolation cuts in the PCB.
All around I would feel better about recommending this as a cheap meter if it had a 10A range. Most of it works well enough for the simple home user but I don't like the idea that they might put the leads in the wrong holes and discover the mistake the hard way.