Ergonomically designed for one-handed operation. The design allows the user to easily wipe off the sample or rinse by running water on the prism. The Automatic Temperature Compensation function of the PEN enables you to take measurement readings regardless of the ambient temperature. Calibration with water only. Convenient storage case included.

Digital Display - easy and accurate readings without user interpretation

Fast & Easy - measures in 2 seconds

Water Resistant - run in under the faucet for fast and easy cleanup

8000 Measurements - from a single alkaline AAA battery