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What is this component, a capacitor, resistor or conductor?

I have a portable pH meter but cannot measure alkali/basa. I think the sensor working perfectly: out 0-5V equals 0-14pH.

I try to measure with omh scale, the result over 1M sometimes over 4M, when I measure with the capacitor scale the result is 2nF. I try to change with resistor of 100K, with a capacitor of 10uF but pH meter cannot measure.

marking 100K

Thanks

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  • \$\begingroup\$ looks like a polystyrene capacitor. Value could be 10pf. or could be 100pf \$\endgroup\$
    – glen_geek
    Commented Dec 31, 2019 at 17:44

2 Answers 2

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It's a 10pF 10% polystyrene capacitor. 100 means 10 * 10^0 pF = 10 pF, K means 10% tolerance.

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I didn't think they could make plastic caps as low as 10pF.

So my guess is 100 pF K=10%

... and it must be an RF (AM Radio) suppression cap on the ADC input of ICL7126

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