Micro pH electrodes

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Micro pH electrodes can measure pH in a very small volume. Long stem versions can reach bottom of NMR tubes.

brand	manufacturer	catalog #	type	description
Accumet MicroProbe 1.5 inch flexible stem	Cole-Parmer 1-800-323-4340 (USA)	#13-620-96	glass/calomel	1.5 inch (127mm) stem length x 3 mm diameter; stem PTFE coated, flexible join to body won't easily break as full glass versions; works well with eppendorf tubes and multiwell plates
Accumet MicroProbe 6 inch flexible stem	Cole-Parmer 1-800-323-4340 (USA)	#13-620-95	glass/calomel	6 inch (254mm) stem length x 3 mm diameter; same as above but longer stem - will fit into NMR tube of appropriate length