Blueduino Rev2 service UUID for web bluetooth
If the 0xFFF0 Bluetooth Service is not advertised by the Blueduino Rev2 board, you should not include it in the "services" key. It should be in "optionalServices. See https://developers.google.com/web/updates/2015/07/interact-with-ble-devices-on-the-web#request_bluetooth_devices

I think your code should look like:

navigator.bluetooth.requestDevice({
  filters: [{ name: 'ZeroBeacon' }],
  optionalServices: [0xFFF0]
});