$108 for an icemaker tester? Don't waste your money. Just jump T to H with an insulated wire. That will start the icemaker. Pull the wire out after a few seconds. Then go back the inlet valve, put your meter leads on the valve terminals and wait. When the ejector fingers reach about high noon the icemaker it will send voltage to the valve for about 7 seconds. The voltage is in series with the mold heater so it won't be 120 VAC, it will be about 107 VAC. The best way to know for sure if it works is to hook it up to water and let it run. I bet you could find fittings to adapt it to your garden hose. If that's not possible, just fill the icemaker with water. If your freezer temperature is cold enough, it should eject the ice within an hour or two.