All-in-One Testing Solution: Measures nine essential marine parameters, including pH, Alkalinity, Ammonia, Calcium, Magnesium, Nitrate (Low and High Range), Nitrite (Ultra Low Range), and Phosphate (Ultra Low Range). Nitrate low range I added to unit. However you need the syringe and the reagents for it. Unit never came with low range just it can test it. syringe you need is liek this https://www.vitalitymedical.com/10-ml-syringe-without-needle.html?sku=BND302995_ea&gad_source=1&gad_campaignid=24386138300&gbraid=0AAAAAD_kCFG_c7wb4auwZuAG2nzBEyoHl&gclid=CjwKCAiAquDXBhApEiwAoyNqBBv587I-25AKDuv1EXDapvPXV8U_NzW5xxkj-7jbWZKEz87k8m9QMBoCFooQAvD_BwE