The Extech 430 overshoots on all readings. A lot. For example, when measuring a simple 9V DC battery, it will display 18.11, then 9.01, then 9.00, then 8.99. This takes about 1 to 2 seconds before a stable reading is found.
Yeah, I noticed Dave's review of the EX330 had similar problems with overshoot, I suspect I might end up with the same problem if I choose an Extech.
I haven't compared this meter with any others, but the AM-510 might be worth a shot
Not a bad looking meter, though I really want a meter with temperature measurement capabilities so I might consider the
AM-520.
Comparing a few of the AM-520 specs with the AM-240:
1. AM-520 can measure up to the 1kV range vs. 600V for the AM-240
2. AM-240 has 0.5A/250V and 10A/250V fuses while AM-520 is spec'd with 0.5A/1000V and 11A/1000V fast fuses.
3. Better temperature resolution for the AM-520 (0.1C vs. 1C), [-40C,1000C] range for AM-520, [-50C, 700C] range for the AM-240, better accuracy for the AM-520
4. Separate mA/uA and V jacks for the AM-520
5. AM-520 has a non-contact voltage detector
6. AM-520 has a flashlight on it (not just a backlight, an actual flashlight)
7. AM-520 comes with a velco strap
8. The AM-520 supposedly has some sort of bar-graph display for fast changing signals
9. AM-240 can measure duty cycle, I don't think the AM-520 has this capability
10. The AM-520 uses a 9V battery, while the AM-240 uses 2 AA batteries.
As far as price goes, the AM-520 is about $5 more expensive than the AM-240 so it's pretty tempting.