What's the best brand of stethoscope, sphyg & pulse oximeter for nursing students?

I've been debating whether to buy paraphernalia already since our president sent a list of items needed from her friend that's already in 4th year. May HA na rin kami so I'm planning to buy those things but I'm still looking for the best brands that is durable and has a good quality. Gusto ko po sana ay yung malakas ang tunog sa stethoscope, may cm po kasi ako na nakabili ng Baxtel sa may Bambang and yung isang part mahina and yung other part naman po is walang tunog (yung sa may tenga).

And if ever po na may primus, mti and mdf, how's your experience po pala with these steths?