Rheometric Scientific (Rheometrics)

15 year lifetime guarantee available

 RDA 700 RDA 2  RDA 3
 RFS 84-8500 RFS 2 RFS 3
 RDS 2 RMS 800
RSA 2 RSA 3
ARES (all models)

no lifetime guarantee possible

 DSR SR 5
SR200/500 SR2000/5000
DMTA 4 DMTA 5
RM 180