see this Mastech M9803R
shot from his box, with schematic http://www.rapidonline.com/pdf/85-2295.pdf
you can buy from amzonhttp://www.amazon.com/gp/product/B0007ZKESG/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=AMH4W1K8OCGMX#productDetails
(2) Backlighted display
(3) Convenient form factor, and it has a fold out stand, which I find necessary.
(4) Compartments for either AA or 9V batteries are a nice touch, as is the hatch on top to stow the probes and cables.
(5) The display is clear and easy to read, although it provides limited visibility when viewed from above at an angle of perhaps 60 degrees (it offers sufficient lateral visibility).
(6) Carrying handle is, well, handy.
(7) Measures capacitance and frequency in addition to the usual suspects
(9) Faux analog meter
(10) RS-232 port/cable to link with computer (some serial-to-USB adapters may not work with this device; this is typically a driver issue)
On the minus side:
(1) Insubstantial (cheesy) and unusable probes. These could even be a safety hazard around high voltages. I had a professional set on hand that I am using with the M9803R.
(2) No marker on the FUNCTION/RANGE SELECTOR knob, so you can tell which setting it's pointing to. I corrected this by daubing a line of red model paint in the appropriate groove.
(3) The beep, for making continuity checks, for example, is not loud enough!
(4) Tiny little Philips screw to access the battery compartment
(5) No auto shutoff
(6) "Chinglish" Users Manual -- One of my faves: "The Continuity Measurement is always fixed the range." Hey, Honey. I fixed the range! When's supper?
also here it is the source code for the uart RS232 interfacehttp://sourceforge.net/projects/mmeter-read/
the price seems good, what do you think about ?