Replacement Cuvette (POL2Sp-kv) for PoolWaterLAB / PoolLab 2.0Keep photometer accuracy consistent with a crystal clear replacement cuvette The cuvette is the optical measurement cell of your photometer. A clean, clear cuvette helps keep readings consistent because the device measures light through the sample. If you want lab grade results you can stand behind, a fresh cuvette is one of the simplest accuracy upgrades you can make. Compatible with PoolWaterLAB photometer PoolLab 2. 0 Why this matters for accuracy