There are two scales used.

The HEAVY SCALE and the STANDARD SCALE.

Toplace uses the Heavy Scale. Coolpiece uses the Standard scale. Not sure what other companies use.

Here is a comparison chart:

First number is Heavy Scale
Second number is Standard Scale

40% 50%
45% 60%
50% 65%
55% 70%
60% 80%
65% 85%
70% 90%
75% 100%
80% 105%
85% 110%
90% 115%
95% 120%
100% 130%
110% 140%
120% 150%
125% 160%
135% 170%
140% 180%