more capabilites then expected

I have owned and used Tenma test equipment for years working in the Energy Generation Industry. This DVM looks and operates very much like the Fluke I use on the job. I haven't tried the RS232 or Bluetooth so I cannot comment on those.

Functions tested to date work well as benchmarked against a Fluke multimeter. Tested voltage, current (to 1 amp), and temperature probes thus far. The USB computer interface works well, which is amazing. Data output rate is 2 samples per second. Manual is a bit terse, but far better than some I've seen on low cost equipment. The USB interface is optical. I looked for a R-232 or USB connecter for awhile before I realized the two clear flush ports were optical interfaces to the slide in USB interface cable optical end. There are both USB and a RS232 to optical interface cables. The included CD installation disk seemed to take a long time to install, with long pauses that made me wonder if it was hung, but it worked fine in the end. PC interface is clear and easy to use. Amazing value at this price.