My AW LB-501 scale came with the AC adapter and two calibration weights. If you use the AC adapter it doesn't time out and cut off. Time out only occurs to save batteries.
Repeatable measurement is a good thing any time you are weighing. For $27 the LB-501 seems like a good deal to me. It's probably more accurate than counting drops and pouring from a bottle into a beaker and then into the mix bottle. That, and you don't have to wash out everything you used. It all goes straight into the mixing bottle on the scale and from there to the shelf it will be stored on to vape from.
Repeatable measurement is a good thing any time you are weighing. For $27 the LB-501 seems like a good deal to me. It's probably more accurate than counting drops and pouring from a bottle into a beaker and then into the mix bottle. That, and you don't have to wash out everything you used. It all goes straight into the mixing bottle on the scale and from there to the shelf it will be stored on to vape from.