Step Wedge (VW) Bloc Type K1 (=V1) Bloc Type V2/12mm (=K2/12mm) Bloc Type V2/20mm (=K2/20mm) Sitescan D-50 SONATEST Prüfkopf DKS-537 D-70 CD2-20 replacement by TSTARC-2-20Z TSTARC-2-20Z CH700-P CH700-P Obsolete -Sonagage II - replaced by SONAGAGE IV or SONAGAGE III SONAGEL W ( 1 Liter) SONAGEL W (1x125ml) SONAGEL W (8x1 Liter) SONAGEL W (25 Liter)