I’ve been using this fish scale. Seems to be pretty accurate, currently on sale with a 10% coupon.

[Upgraded]FS01 Fishing Scale, Dr.meter 110lb/50kg Digital Hanging Scale with Storage Function and Numerical Comparison, Backlit LCD Display, Measuring Tape and 2 AAA Batteries Included https://www.amazon.com/dp/B078KP5YGP/ref=cm_sw_r_cp_api_glt_i_3R0BEN6QF1HAJ8DXPYCY?_encoding=UTF8&psc=1