Testo 0650 2063 pH universal plastic electrode without temperature sensor. Robust and dirt-insensitive pH electrode with single-pore diaphragm. Unbreakable plastic. Maintenance-free gel-electrolyte. Includes storage cap. Operating temperature range: 0 to 60 ° C, Short-term to 80 ° C. Measuring range: 0 to 14 ph.