They all seem to have problems and as we use Alaris pumps we follow their test procedure and use mechanical guages to measure the plunger displacement and force.
We've used the Ultramedic analyser in the past with the intention of saving time - but in fact we found that we were spending a lot of time chasing false failures caused by air bubbles, sticking syringes, eroneous readings etc.
The old fashioned way seems to be the best - even if that means purchasing an electronic stopwatch to alarm when you need to measure the fluid in the burrette !
