Sonicaid Digital SR2/SR3 Waterproof Rate and Trace Display Dopplers with fixed 2MHz or 3MHz These high affectability handheld Digital Dopplers are planned for universally useful screening of the fetal heart at all phases of pregnancy from as ahead of schedule as 8-10 weeks, directly through to work. The connected tests are waterproof (IPX7) for high affectability FHR discovery in both typical use and in waterbirth checking. Pick between 2MHz (SR2) or 3MHz (SR3) fixed test alternatives. The 2MHz model is a universally useful test for use at all phases of pregnancy. The 3MHz test is the test of decision for some clinicians for use in early incubation.