Miniature Tension and Compression Load Cell 3kg/20kg/100kg to 500kg

I want to know if your 3kg/20kg/100kg to 500kg load cell is affected by magnetic field?

Looking for a disc type compressive load cell capable of a max load of ~300kg. What outputs do your load cells have? What is the resolution/accuracy?

I need a load cell which will be constantly under weight (up to 300kg ). In my application, I need to monitor the reduction of that weight (the weight load will decrease by a multiplier of 5KG), and then output that difference in weight change.
Basically a "reverse load cell" or an "unload cell".
My main concern, how do your load cells show under constant weight for prolonged periods, does such a cell exist which is able to handle this scenario?

When we connect 2 load cell to display controller via junction box, what would be the reading refers to?

I want to buy a Miniature Tension and Compression Load Cell 3kg sensor for my application. And I have two questions.
1. If I power the sensors with 5 volts, what type of output voltage should I expect for the full range? 0 - 5 V? Do I need an external amplifier?
2. Our application will apply a small (0.05 Nm) torque on the sensor. (if the sensor's main axis is in the Z direction, the torque is around the Rx/ Ry axes). Can you tell me if that is an issue with this sensor? Does it affect the measured force?

I already had switched the green and white cable so that the order was green, white, red, and black. This gave me an inclining positive value as you said but that does not seem to be the problem. When I measure the signal being outputted directly from the load cell, it seems to affect the accuracy if the signal is a negative value. I'm measuring the signal over the S- and S . So when I first tried to calibrate I went through the process as mentioned in the description. But when I removed the weight and put it back it seemed to be way off. So I checked the S- and S  and saw the values being negative. Then I calibrated the zero level til I had a positive value on the S- and S  readings and then the accuracy seemed to be right. Although the zero level was now 2V. How do I fix this?