New Purchase

Cem DT337 --- very low current DC clamp meter for tracking down parasitic drains, delivery was around 10 days from China.

I have been wanting one of these for a while, with the Sterling-Euro exchange rate going down I thought I better hit the buy button. The build quality isn't wonderful but it didn't cost thhe earth and when I did a quick test on a main battery earth cable it showed a within spec 68mA parasitic drain.

You caught my interest on this one. Do you think the accuracy lives up to the specifications? Also, what's the jaw diameter? Asking because I can see this being very useful for parasitic drain testing. The ol' low amp probe can't be trusted that low, and I dislike disconnecting battery cables if at all possible.

I haven't been able yet to do any really accurate test but it seems the real deal I put some very small LED's in series and it would repeatedly show a 2 to 5 ma difference in current when removed or added an led to the chain.
I measured the size of the eye of the clamp and it is 1/2" dia an M12 bolts fits through the hole without touching the sides. it certainly fits over the main earth cable on the two cars I tried it on a 2 litre diesel and a 2.5 v6 which had 10mm OD cables.

One thing I did notice was that when test on small wires the angle of the clamp to the wire could alter the reading by quite a large number of mA. If the eye of the meter is at 90 degrees to the wire the readings are perfect but if it lies flat on the cable the readings are considereably higher. This probably applies to all clamp meters but more noticeable on this meter because of the much higher sensitivity. This wasn't a problem on main battery cable