2PCS 1kg 5kg 10kg 20kg Digital Load Cell Weight Sensor High Precision Miniature Load Cells for Arduino DIY Electronic Portable Kitchen Scale Sensors (5kg)

Ok, there's about a million of these things out there and there's no telling which have been engineered from the datasheets and which have been copied, and badly. This one is one of those bad copies, I think. To test, check for a connection between E- and GND. If there is a connection then you have a good board. If not, a connection needs to be made. The entire bottom side of the board is a GND plane so clear a spot by scraping the green coating down to copper next to the E- via bottom side and add a solder bridge. Done. By the way, the only way to increase the sample rate above 10 SPS without an external oscillator is to desolder pin 14, bend it up and solder bridge pins 14 & 15. Pin 14 with VCC switches 80 SPS mode.

Load cells arrived broken, output values do not change at all from input force.

SCAM. AVOID. LOAD CELLS DO NOT WORK AT ALL!