Neutral Density Conical Filter for the HMsERG

Neutral Density Conical Filter for use during and with the Hand-held ElectroRetinaGraph rodent ERG recordings.  Lowers flash stimulus to -5 log (0.03mcds/m²) to capture Scotopic Threshold Response (STR).

[Used by Veterinarians, Large Animal Clinics, Researchers and Small Animal Studies]