Related Clues:
- Glass tube
- Measuring tube (var.)
- Item of lab glassware
- Lab dispenser
- Tube ending in passage alongside canary, say, in mine
- Narrow tube in chemistry
- Calibrated glass tube
- Item of chemistry lab glassware
- Chemist's tube
- Calibrated tube
- Chemistry lab item of glassware
- Eyedropper, essentially
- Tube for liquid in mine covering domestic source of electricity
- Lab dropper
- Drop producer's best sci-fi films back-to-back