Designed for water quality experts, the Hach HQ440D Laboratory Multi-Meter is an advanced laboratory meter that takes the guesswork out of measurements. HQD digital meters connect with smart Intellical electrodes that automatically recognize the testing parameter, calibration history, and method settings to minimize errors and setup time. The advanced HQD Laboratory Meter is designed to withstand years of continuous lab use. HQD bench meters feature a simple user interface that does not require manuals or training to operate. The Intellical PHC805 is a digital, combination glass-body laboratory pH electrode with a refillable Ag/AgCl reference and built-in temperature sensor. The PHC805 has a porous pin junction and is ideal for measuring pH in general purpose applications.