Based on this product's specifications, here are some alternatives and similar models
Radio Flash Trigger Sender Sekonic RT-EL/PX for L-858D (compatible with Sekonic L-858D)
Summary description:
Sender Sekonic RT-EL/PX is a radio flash trigger designed for use with the Sekonic L-858D light meter. It enables wireless triggering of compatible flashes for synced exposure measurement and flash testing. The accessory simplifies remote flash activation during on-camera or off-camera metering, helping photographers speed up setup and verify flash output without manual sync cables.