Regarding respirator testers what are the branded products?

About respirator tester, I recommend the products of Dr?ger brand, this company has more respirator tester products to choose from. For example, Prestor 5000, Testor 2500/3500, RZ 7000, Quaestor 6000/8000, Porta Control 3000, etc., are all breathalyzer testers under the Dr?ger brand.