Thought this might be a useful recollection after reading:
https://www.eevblog.com/forum/testgear/best-cheap-lcr-meter-for-small-capacitors-and-inductors/25/We have a couple cheap non-OEM SMD Fixtures for use with lab grade LCR meters, OK know it's not wise to strap on a cheap fixture to a quality lab type instrument, here's the story. We did have a quality OEM set of Tweezers (Tonghui TH26009B) that helped with some SMD component selection and verification for a major project. When the precision SMD components we required became unavailable we were forced (actually major redesigns 4 times to accommodate available components!!) to use what was available and do selection. These were thousands of components and after using the OEM Tweezers for awhile (tedious as heck!!) decided to get a proper SMD Fixture, however the OEM SMD fixtures were unavailable with deliveries "expected" in many months, so we took a change on a couple available cheap SMD Fixtures that "looked" OK.
The build quality isn't great in both fixtures, but sufficient. After some time playing around before committing to actual use (precision component selection) they seemed OK, but a little concerned about the case lid grounding. One lid was completely painted, the other partially painted but both relied on mounting screws for grounding, fixed this with a knife & drill bit scraping some paint off. Also noticed the internal BNC grounds were not connected on one that had the star ground washers, so we corrected this by soldering in grounding wires. Then repositioned the internal wires towards the middle of the enclosure to minimize parasitic shunt capacitance, this is between the internal shield between the L and H sides.
After we suffered thru the measurements long ago we began to notice more uncertainty in the readings, especially in one fixture, then it began to fail DC Short calibration. We found the threaded insert that is orthogonal to the plunger contact, where the Force and Sense wires come together between the BNCs and plunger was slightly loose. So was the other plunger insert. The plungers were removed and these inserts well tightened and everything reassembled with good results again!! Then we began to experience some increased uncertainty with the other SMD fixture and found the same result, loose threaded insert. Both Fixtures perform well now and serve our needs.
A couple tidbits on getting repeatable results with these SMD Fixtures (probably holds true for the OEM fixtures as well). When you do a Short and Open cal the fixture moveable plunger moves, this also moves the internal wires slightly. For best results we often use a similar size SMD Zero Ohm for the Short calibration, then use a spacer on the plunger arm to open the contacts to about the same space as the expected DUT. Because the wires move, the internal fields in the fixture change slightly influencing the results. Using a similar size Zero Ohm SMD for Short Cal and same contact spacing for Open Cal you are helping keep internals similar for the DUT measurements.
Of the two SMD Fixtures shown the one in front with the 4 BNC lever arms is the better build and mechanically more stable, however both achieve very repeatable and comparable results on either of our TH2830 or IM3536 Lab LCR meters. Recall both were under $100, not a OEM replacement, but if one doesn't mind tinkering around then not too bad a alternative.
BTW the Ugly one has a grey 3D printed SMD support, we needed to replace the original because it was useless for small devices which is what we normally use.
Anyway, hope this helps some folks considering a cheap SMD Fixture for LCR meters.
Best,