A couple of years ago I tested 400+ LTO pouches, 55 AHr each, using this discharge tester:
[img=800x600]
Sourced from ebay; same vendor no longer active, but similar units still available for under US$20 each.
I bought 16 of them and mounted in pairs, all powered from one lab power supply:
[img=800x600]
Discharge is up to 10A, up to 60W (I never used them beyond ~25W). They beep when discharge to a selectable voltage is finished.
Then they display the total amp-hrs and watt-hrsdischarged, and the average voltage.
In between discharge tests I charged the sixteen cells per batch connected in series, using the Chargery BMS-24T, which I found worked quite well. Here is a picture of a stack of pouches being charged:
[img=800x600]
Note the plastic sheet insulators between alternate electrodes! Also how I numbered the clips I used to extend the Chargery's leads, and a bit of color coding that helped me avoid errors at connection time (as you all know, cell testing can be mind-numbingly tedious and repetitive!). The larger red and black insulated clips are simply joining pairs of + and - electrodes in series; so alternate pouches are flipped upside down.
I recorded the data using a rudimentary OpenOffice ODBdatabase:
[img=800x600]
This database accepts multiple discharge session entries per cell, using the cells' serial numbers to identify them. So afterwards I could summarize the max, min, and average AH for each cell, from which I develop a sorting list to ensure each "supercell", or block, gets the same average AHrs as the others (I think of this like choosing team members for school-yard sports teams; you want to have an equal mix of strong and weak players on every team).
I have more photos showing a bit more detail of the construction of the discharge rack, in case anyone wants to see.
So to answer the OP's question, these little ebay dischargers worked well for me; and I see there are many new versions available now, with substantially higher power rating, bigger heat sinks and fans, nice enclosed cases, etc.