The TruLine Ammonia ISA is manufactured by YSI. TruLine Ammonia Ionic Strength Adjustor Solution used with ISE TruLine electrodes, 500 mL. It is an accessory for the following products: TruLine Ammonia Electrode Kit TruLab pH/ISE 1320 Laboratory Instrument MultiLab 4010-2W Laboratory Instrument MultiLab 4010-3W Laboratory Instrument