... Calibration * Large LCD * Store up to 99 Data Sets Bante931 Sodium ion meter used for measuring the sodium-ion concentration ... for optimum accuracy under variable temperature conditions.Message Indicator:BANTE931 meter displays helpful messages like an on-screen manual ... Selective Electrode (Made in US), Temperature Probe, Power Adapters BANTE931 Sodium Ion Meter (Using the US ISE, CE Certification)