Double Contact Morse Code Key Face Size_26mm pairing a six-step 0 to

pairing a six-step 0 to 12V AC line with a continuous 0 to 12V DC line through color-coded lab terminals

Plain bend receiver adapter in borosilicate glass features 19/26 socket and 24/29 cone for distillation collection with right-angle redirection

Long-focal double-concave glass lens at 75mm diameter and 300mm focal length

Cell ultrastructure model displays detailed organelle architecture

5 mL in a two-tier stackable frame

Double Contact Morse Code Key Face Size_26mm pairing a six-step 0 toTwo armed Morse code contact key with a press knob over each spring arm, sized for paired station telegraph demonstrations where one key sends and the other relays back.