Handheld TDS Water Testing Meter , Electronic Ph Meter With 1 Point Calibration

YIERYI Digital ORP Tester electrical 0-1999mg/LmV ORP Meter ORP-986 Water Hydroponics

Specifications:

• Remove the protective cap. Do not be alarmed if white crystals appear around the cap.
• This is normal with ORP electrodes and they dissolve when rinsed with water.
• Turn the meter on sliding the switch on the top.
• Immerse into solution up to the max immersion level.
• Stir gently and wait until the display stabilizes.
• After use, switch off ORP meter,, use the water clean the electrode and replace the protective cap.
• Do not use distilled or deionized water for storage purposes.
• Large fluctuations in readings could be due to lack of calibration, dry electrode or rundown batteries.
• Attention :during 2-3 weeks, put electrodes in 3mol/L KCL solution for 12 hours, to make sure the reading within accuracy.

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​note

1, the time to gently shake the instrument a few times, can not let the bubble on the electrode, otherwise it will affect the measurement results

2, can not arbitrarily tune the instrument, only the instrument has been used for a long time, or the use of particularly frequent, it should be re-calibrated

3, such as the number of errors encountered in the indication, indicating the value of beating, the value does not return to zero and other phenomena, the instrument should be inserted into the following parts of the immersion in alcohol to shake a few times to clean the sensor. In the low temperature or wet state, the indication does not return to zero (the last bit of the display load 2 or less), will not affect the measured value.