Video: Hoyt HLS-110 Digital Synchroscope Published by Hoyt Meter Video: Hoyt Switchboard Syncroscope HLS-110 More information: HLS-110 4.5" Digital Synchroscope. Get a Quote Digital Synchroscopes. Analog Synchroscopes HLS-110 Analog Switchboard Series (Video) Hoyt HLS-110DI Analog/Digital Switchboard Meters (Video) Email Email to a Friend