Will this work with an epson workforcepro wf-3720?

No, your printer will take the T702. The 215 will not work with it.

How many cartgridge it take

There is one cartridge per package unless you purchase the multi pack. The printer itself takes one black cartridge and one color cartridge.

How can I determine ink levels in my workforce 100

When you turn on the WF-100, the screen on the unit will show the levels of ink in the cartridges. If you do not see them there. Open the print window on your computer and choose to see the supply levels.

ASIN	B00O1A96RS
Best Sellers Rank	325,720 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 15,963 in Inkjet Printer Ink Cartridges
Brand	Epson
Brand Name	Epson
Colour	Black
Compatibility Options	Genuine
Compatible Devices	Epson WorkForce WF-100, products:Epson
Compatible Printer Models	WF-100, WF-110, EC-C110
Compatible devices	Epson WorkForce WF-100, products:Epson
Customer Reviews	4.7 out of 5 stars 1,495 Reviews
Global Trade Identification Number	00010343916340
Ink Base	Water
Ink Colour	Black
Ink colour	Black
Item Weight	0.07 Pounds
Item height	4.5 inches
Manufacturer	Epson
Model Name	T215120
Model name	T215120
Other Special Features of the Product	Water Resistant
Page Yield	215
Page yield	215
Special feature	Water Resistant
UPC	010343916340
Unit Count	1.0 Count

Epson T215120

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