> High accuracy
> Automatic calibration
> Waterproof

Large Display pH Pens provide stable and accurate readings from 0-14. Designed for simple and convenient one hand operation. Automatically calibrates to pH 4,7 or 10 buffers and can also be adjusted to recognize non-standard buffers. Features include hold funtion; ATC; automatic power off; low battery indicator and waterproof housing. Supplied complete with built in electrode and batteries.