I've got a Lyman Digital Pocket scale, ($25) had for 2 yrs. Looks similar to the Frankford, just different face; the chassis and cover look the same. No matter which scale you get, be sure to get a set of calibration weights ($35) to compliment the single cal weight that comes with the scale.
Put the scale in the environment you are going to use it in; garage, house, shed, for at least 2 hr before use, with the scale turned off. Use fresh batteries, keep it away from air currents (AC or fans) keep it 6 ft from electrical interference (phone, flourescent lights).
Mske sure it is level or make a "leveling" board. Check the scale, leave the scale on and close the cover, if the scale reads anything other than 0.0, the cover is binding on the load cell (mine did). Either store it with the cover open/off or shim it with masking tape.
My Pacific Powder balance (80+ yrs old) is my golden reference. The set of weights that came with it are accurate on the digital scale. Powder balance for powder, digital for bullets and cases.