You could use an old pillow case, hold it against the feeder with gloves on (the pellets HURT) and have your wife hit the test button. You can weigh the pellets in the bag to find out how much it throws.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).