PH-80 by HM is an economically priced but professional meter.
SPECIFICATIONS:
pH Range: 0 - 14
Temperature Range: 1-55 °C; 32-131 °F
Resolution: 0.1 pH; Temperature resolution is 0.1 °C/F
Accuracy: +/- 0.2 pH; Temperature accuracy is +/-2%
Calibration: Digital automatic calibration (one point)
Minimum EC/TDS: 10 µS/5 ppm
Electrode: Glass sensor and reference tube electrodes
Housing: Water resistant
Power source: 3 x 1.5V button cell batteries (included)
Measures pH and Temperature, One-touch automatic digital calibration, Water resistant, Automatic Temperature Compensation (ATC), Auto-off function, data-hold function and low-battery indicator. Includes storage solution in a sponge embedded in a translucent cap. Factory Calibrated: