How would it test pH in a person? How can we do it once purchased?

I am not sure if you can use this to test the pH if a person. Perhaps by putting it in sweaty skin. You should call manufacturer to see if they can answer your question.

can i use this meter for cheesemaking?

Don't see why notCheesemaking websites list similar ones, maybe less precise than this but same technology

Can I use for stiff dough?

Yes you can. This can read liquids and solids. I use mine to measure the ph of cheese curds and whey.

I have a very similar meter but it is "ph110" instead of "ph100." will this "ph105" sensor work with the "ph110?"

Yes the PH105 is the replacement pH electrode for both the PH100 and PH110.

Extech Ph110 Waterproof Exstik Ph Meter

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Sold byAmazon DenmarkDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Precision pH Testing That Keeps You in the Flow

READY OUT OF THE BOX - Complete kit includes electrode, KCl solution, reference junctions, tools, batteries, and neck strap for instant use.
STAY ACCURATE STAY AHEAD - Auto-recognizes buffer solutions with 1, 2, or 3 point calibration for precision you can trust.
ECO SMART COST EFFECTIVE - Refillable pH electrode eliminates frequent replacements—sustainability meets savings.
BUILT TO BRAVE THE ELEMENTS - IP57 waterproof rating means reliable performance even in wet, challenging environments.
VERSATILE MEASUREMENT MASTER - Flat surface electrode measures pH in liquids, semi-solids, and solids—adapt to any sample.

The Extech PH110 Waterproof ExStik pH Meter offers professional-grade accuracy with a refillable electrode and automatic 1-3 point calibration. Its IP57 waterproof design ensures durability in tough conditions, while the flat surface electrode provides versatile pH measurement across liquids, semi-solids, and solids. Complete with essential accessories and powered by included batteries, this meter is engineered for reliable, long-term use in lab and field environments.

Specifications

ASIN	B004WN9QUG
Batteries	4 Lithium Metal batteries required. (included)
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Best Sellers Rank	#150,635 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #148 in Lab pH Meters
Color	Blue/Grey
Customer Reviews	4.2 4.2 out of 5 stars (78)
Date First Available	September 1, 2004
Included Components	Refillable pH electrode, a 1.5mL KCI, reference junctions, removal tools, cap, cup, batteries, strap
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	3.87 ounces
Item model number	PH110
Manufacturer	Extech
Number Of Pieces	1
Part Number	PH110
Pattern	pH Meter
Power Source	Battery Powered
Product Dimensions	6.8 x 1.6 x 1.4 inches
Style	PH110
Warranty Description	Full one year warranty on parts and workmanship, unless otherwise specified. This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification.

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