Materials:

200 mL mason jar Find Part
• $0.01-$0.04/jar (Bulk discount; MIN = 10,000 units)
• Per unit: $0.04
Glass reference electrode housing Find Part
• Cost: $2.65/8 tubes
• Per unit: $0.33
Magnesia sticks (needed to complete housing) Find Part
• Cost: $43.70
• Makes 500 housings
• Per unit: $0.09
Potassium Chloride Find Part
• $219.34/2.5 kg
• 1.3 g/housing
• Per unit: $0.01
Titanium wire
• 15cm/wire
• Per unit: $0.81
Carbon felt
• $52.18 per sheet
• 30 x 30 cm (6.35mm thick)
• 25 x 25 mm/unit
• 144 electrodes per sheet
• $0.36/unit
Sterile 18G needles
• $0.05 ea.
• x 2 per unit
• $0.10/unit
3mL syringe
• $0.04/unit
Rubber stopper
• trade size #12 (2 1/2", tapered to 2 1/8")
• $2.31/unit
Rubber stopper
• trade size C (3/8" tapered to 7/32")
• $0.71/unit
Octogonal magnetic stir bars with pivot ring
• $1.60/unit
Leit-C for microscopy (carbon cement for electrodes) Sigma Aldrich
• $48.20/30g
• $0.64/unit
Xylene
• $0.005/500mL
18G Hypodermic sampling needle (3") Fisher Scientific
• Pack of 100 for $39.26
• $0.39/unit

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