commercial L/C meter are very costly what you required here is a project working great and have same feature which you need.
Last November I searched for the best option to buy, more precisely the model with the best price-quality ratio.
So I bought the LCR Meter DE-5000 from DER EE.
I like it very much and recommend this one.
The cheapest I could find was on eBay for 89€ with free shipping. I had to pay around 33€ of customs.
I don't know if this is too expensive for you, but for sure it's worth each penny.
You can easily make the optical USB interface if you need one.
I classify this type of meters as "nice toy to have around because they are so cheap".
I don't even trust my Brymen Multimeter BM869S (209€) to measure capacitors. I've seen bad capacitors that looked OK on the Brymen, as is only measures capacitance (no other parameters).
Good LCR meter is depend of your need - whether you design RF circuit it is not even close to good or accurate.
Most of LC meter of DIY staff is with the same principal of using a comparator as an oscillator and measuring the frequency it produce with the microcontroller for a DIY it is very good and easy to build.
For a good professional product you need to use a 4 wire tester mostly very expensive product but some can be found 2nd hand on EBAY for reasonable price for whom who can afford it.