Widely used for testing aqueous solutions. Ideal for laboratory probes or electrodes. < p>Suitable for most ORP meters and controllers with BNC Q9 connectors. Filled with saturated colloidal kcl solution, used for the treatment of chromium-containing wastewater on printed circuit boards and online detection of ORP. The material is environmentally friendly, harmless to the human body and has good conductivity electric. Suitable for water systems such as water sources, aquariums, hydroponics, laboratories, hot springs, swimming pools , etc. Specification: no user manual Material: PC Model: ORP-101 Type: Laboratory electrode Probe Type: Sensitive Crystal Ball Bubble Range: 0~1999mV Accuracy: 5 mV Applicable temperature range: 5~70 Potential ;electrode: 245-270mv (15~30) Internal resistance of reference electrode: 10k Electrode stability: 8 mv/24 electrode indication electrodes: good conductivity Plug type ;electrode: Q9 BNC: vertical pH electrode wire length: about 70cm Item size: about 155 x 20 x 20 mm/(ORP electrode) Item weight: approx. 49.6 g.