diff --git a/SimPEG/tests/TestUtils.py b/SimPEG/tests/TestUtils.py
index 9b2158c4..ee8f90e4 100644
--- a/SimPEG/tests/TestUtils.py
+++ b/SimPEG/tests/TestUtils.py
@@ -67,8 +67,7 @@ class OrderTest(unittest.TestCase):
 
     name = "Order Test"
     expectedOrders = 2.  # This can be a list of orders, must be the same length as meshTypes
-    _expectedOrder = 2.
-    tolerance = 0.85
+    tolerance = 0.85     # This can also be a list, must be the same length as meshTypes
     meshSizes = [4, 8, 16, 32]
     meshTypes = ['uniformTensorMesh']
     _meshType = meshTypes[0]
@@ -124,6 +123,8 @@ class OrderTest(unittest.TestCase):
 
         """
         assert type(self.meshTypes) == list, 'meshTypes must be a list'
+        if type(self.tolerance) is not list:
+            self.tolerance = np.ones(len(self.meshTypes))*self.tolerance
 
         # if we just provide one expected order, repeat it for each mesh type
         if type(self.expectedOrders) == float or type(self.expectedOrders) == int:
@@ -134,6 +135,7 @@ class OrderTest(unittest.TestCase):
 
         for ii_meshType, meshType in enumerate(self.meshTypes):
             self._meshType = meshType
+            self._tolerance = self.tolerance[ii_meshType]
             self._expectedOrder = self.expectedOrders[ii_meshType]
 
             order = []
@@ -144,7 +146,7 @@ class OrderTest(unittest.TestCase):
                 err = self.getError()
                 if ii == 0:
                     print ''
-                    print 'Testing convergence on ' + self.M._meshType + ' of:  ' + self.name
+                    print self._meshType + ':  ' + self.name
                     print '_____________________________________________'
                     print '   h  |    error    | e(i-1)/e(i) |  order'
                     print '~~~~~~|~~~~~~~~~~~~~|~~~~~~~~~~~~~|~~~~~~~~~~'
@@ -155,7 +157,7 @@ class OrderTest(unittest.TestCase):
                 err_old = err
                 max_h_old = max_h
             print '---------------------------------------------'
-            passTest = np.mean(np.array(order)) > self.tolerance*self._expectedOrder
+            passTest = np.mean(np.array(order)) > self._tolerance*self._expectedOrder
             if passTest:
                 print ['The test be workin!', 'You get a gold star!', 'Yay passed!', 'Happy little convergence test!', 'That was easy!'][np.random.randint(5)]
             else:
diff --git a/SimPEG/tests/test_interpolation.py b/SimPEG/tests/test_interpolation.py
index d98d58d6..a068c441 100644
--- a/SimPEG/tests/test_interpolation.py
+++ b/SimPEG/tests/test_interpolation.py
@@ -2,7 +2,8 @@ import numpy as np
 import unittest
 from TestUtils import OrderTest
 
-MESHTYPES = ['uniformTensorMesh']
+MESHTYPES = ['uniformTensorMesh', 'randomTensorMesh']
+TOLERANCES = [0.9, 0.6]
 call2 = lambda fun, xyz: fun(xyz[:, 0], xyz[:, 1])
 call3 = lambda fun, xyz: fun(xyz[:, 0], xyz[:, 1], xyz[:, 2])
 cart_row2 = lambda g, xfun, yfun: np.c_[call2(xfun, g), call2(yfun, g)]
@@ -18,7 +19,9 @@ LOCS = np.random.rand(50,3)*0.6+0.2
 class TestInterpolation(OrderTest):
     name = "Interpolation"
     meshTypes = MESHTYPES
+    tolerance = TOLERANCES
     meshDimension = 3
+    meshSizes = [8, 16, 32]
 
     def getError(self):
         funX = lambda x, y, z: np.cos(2*np.pi*y)
@@ -31,6 +34,8 @@ class TestInterpolation(OrderTest):
             anal = call3(funY, LOCS)
         elif 'z' in self.type:
             anal = call3(funZ, LOCS)
+        else:
+            anal = call3(funX, LOCS)
 
         if 'F' in self.type:
             Fc = cartF3(self.M, funX, funY, funZ)
@@ -38,12 +43,26 @@ class TestInterpolation(OrderTest):
         elif 'E' in self.type:
             Ec = cartE3(self.M, funX, funY, funZ)
             grid = self.M.projectEdgeVector(Ec)
+        elif 'CC' == self.type:
+            grid = call3(funX, self.M.gridCC)
+        elif 'N' == self.type:
+            grid = call3(funX, self.M.gridN)
 
         comp = self.M.getInterpolationMat(LOCS, self.type)*grid
 
         err = np.linalg.norm((comp - anal), np.inf)
         return err
 
+    def test_orderCC(self):
+        self.type = 'CC'
+        self.name = 'Interpolation CC'
+        self.orderTest()
+
+    def test_orderN(self):
+        self.type = 'N'
+        self.name = 'Interpolation N'
+        self.orderTest()
+
     def test_orderFx(self):
         self.type = 'Fx'
         self.name = 'Interpolation Fx'