... powr supply. 4.Message indicators Boke934 Benchtop Digital Ammonium Ion Meter Parameters: Ammonium Ion Concentration Range5*10-6~0.1mol/L(1 ... ,900~0.02ppm)Ammonium Ion Concentration Accuracy ±1%F.STemperature Range0~100°c,32 ... Communication interface can be sent data to computer.Meter Included: Ammonium Electrode (Made in US, Assembled in China),Temperature Probe, Power ...