|New from Lionel, the Amp/Volt Meter for ZW controllers allows you to monitor readings on all four ZW channels using a digital LED display. Give e ach channel exactly the power you want by watching the readings increase or decrease as you move your ZW controllers. Simple to install, the Amp/Volt meter fits conveniently on the top of your ZW controller for easy monitoring. Fits new ZW, (item number 6-32930 with 2 180 watt powerhouses), or the new 6-22982 ZW with 2 135 watt powerhouses. zw sold separately.