Peter Moore
Member Since 2019
Should be pretty self explanatory. Tested 4 syringes -
Walgreen's Generic 30g 8mm (1st column)
VetRX 31g 8mm (2nd column)
and 2 BD 31g 6mm (3rd and 4th column)
The 2 BDs are from different photographs of the same drops because it was not possible to get a good picture of all 4 that included the VetRX, since the VetRX was so small. The two photos were scaled to match based on the common 3rd column. This may account for some of the variance between BD syringes #1 and #2.
Conclusions:
BD still rules the day, but the Walgreen's brand was a very close second and almost the same as BD.
The VetRX brand on the other hand dispenses drops that probably would be of negligible value. They are also much more variable than the Walgreen's and BD. However, if for some reason you need a smaller drop than what BD or Walgreen's can provide, then the VetRX brand might be something to consider.
Gauge and needle length don't seem to matter. Walgreen's and BD were different gauges and needle lengths. As I mentioned in another thread, what's more relevant is the amount of pressure that can be applied between the plunger and barrel wall.
ULTIMATE CONCLUSION:
A drop is not a drop is not a drop. It's all relative and highly dependent on the syringe brand, and likely the thumb strength of the person giving the shots. BUT, if it's the same person doing it on the same syringe, you should get very consistent results.
Walgreen's Generic 30g 8mm (1st column)
VetRX 31g 8mm (2nd column)
and 2 BD 31g 6mm (3rd and 4th column)
The 2 BDs are from different photographs of the same drops because it was not possible to get a good picture of all 4 that included the VetRX, since the VetRX was so small. The two photos were scaled to match based on the common 3rd column. This may account for some of the variance between BD syringes #1 and #2.
Conclusions:
BD still rules the day, but the Walgreen's brand was a very close second and almost the same as BD.
The VetRX brand on the other hand dispenses drops that probably would be of negligible value. They are also much more variable than the Walgreen's and BD. However, if for some reason you need a smaller drop than what BD or Walgreen's can provide, then the VetRX brand might be something to consider.
Gauge and needle length don't seem to matter. Walgreen's and BD were different gauges and needle lengths. As I mentioned in another thread, what's more relevant is the amount of pressure that can be applied between the plunger and barrel wall.
ULTIMATE CONCLUSION:
A drop is not a drop is not a drop. It's all relative and highly dependent on the syringe brand, and likely the thumb strength of the person giving the shots. BUT, if it's the same person doing it on the same syringe, you should get very consistent results.