The paste dispenser looks like a syringe, but there is no needle. The plunger is also a measuring stick, and the numbers represent how much the horse weighs in pounds. It is 50-lb for each notch on the plunger. So a 200-lb horse (or a 200-lb person) would use four 50-lb notches on the plunger to dispense a standard preventive dose.
Measurement does not have to be exact. Round up to the next 50-lb increment. So if you weigh 220 lb, round up to 250 lb and use five 50-lb notches.
Wheeeeeeeehhhhheeeeeheeheeheehee!
Nearest Tractor Supply Co for me is about 20 miles....So purchased at the local feed store.
Intermectin Rules.
I want to add that when you first open this, there are air gaps in the tube, so the plunger has a lot of wiggle room. Keep the cap on and push the plunger to tightly compact all the paste into the exit end. Tap the tube multiple times on a hard surface to force the paste to settle in more. Repeat.
Even after getting it all compressed into the end, there will be about an inch of unmarked plunger before the weight notches start. How does one handle that? It will be adding substantially to the first dose.