RKA SWITCH SIMPLEX - dial Ø 56 mm - twin tubes grey - 294.408.94 It is manufactured from shock-resistant polycarbonate and has passed the shock test according to AAMI SP9. The sight glass is chemically stable and unbreakable. The brass valve screw works smoothly and is adjustable to exact settings. Measuring range 0-300 mmHg ±1%. Black velcro cuff. Supplied with pouch. Made in Germany. 2 year warranty.