Electrocorder SL-3V Compact Three Phase Voltage RecorderOverview The Electrocorder SL 3V is a compact three phase voltage recorder for supply voltage monitoring, voltage optimisation checks and long term voltage investigations where a smaller logger is preferred. Use it when you need three phase voltage logging in a smaller enclosure. The SL 3V uses four voltage leads for L1, L2, L3 and neutral and can be used on 400 V three phase systems or on single phase systems where appropriate. Best for: Compact