I got one of these board from eBay for $20. It's amazingly useful--I primarily use it to identify transistors and verify the pinout. I've run some tests on it for various values resistors, capacitors, inductors and voltage drop across some diodes. Attached are the results compared to a Fluke 187 multimeter, Brymen BM869 multimeter, and DE5000 LCR meter. The highlighted green columns are the "reference" columns that other values are being compared to.
* My board is marked as v 2.4 and is stock / as delivered with the Atmega168. It is running the 1.05k software.
* Transistortester resistance readings are within about 1% from 100 ohms - 1 Mohm. Low values have higher error. It doesn't look like it reads < .7 Ohms.
* Capacitance readings were generally close to the multimeter readings, but the DE5000 generally read much lower than the other meters
* Inductance couldn't be measured for the .8 - 1.6 uH inductors --it shows .7 Ohm resistance. Values for 10-
* Diode voltage drops read higher than the multimeters, but the Transistortester was able to produce a value while the multimeters could not
Testing notes:
* Capacitor readings were done at 1kHz on the DE5000 up to 100 uF and 100Hz for 2200 and 6800 uf Capacitors
* Red Led had a measured drop of 1.77V with 1mA, 2V with 20mA
* White led had a measured drop of 2.69V with 1mA and 3.27V with 20mA
I plan on updating the firmware when I get a programmer and possibly doing some of the hardware mods as previously suggested.