ORP-Alkaline Tester
Negative Ion Meter Lutron NI-214
Lutron NI-214 Negative Ion (ORP) Meter with external probe is a capable of measure ORP range of + & - 2000mV.
ORP Meter Lutron YK-23RP
Lutron YK-23RP ORP Meter with external probe is a capable of measure ORP range of + & - 2000mV.
Portable ORP Meter Gondo ORP 6041
Gondo ORP 6041 portable ORP Meter with built-in electrode is capable of measure ORP range of + & - 2000mV.