A dissolution sampler is a device used to collect samples from a dissolution bath at specific time points. It is an essential part of dissolution testing, which a quality control procedure is used to measure the rate at which a drug dissolves in a liquid medium. Dissolution samplers can be either manual or automated. Manual samplers typically involve the use of a syringe to withdraw a sample from the dissolution bath at the desired time point. Automated samplers use a variety of mechanisms to collect samples, such as syringe pumps, peristaltic pumps, and rotary valves.