diff --git a/src/scgenerator/__init__.py b/src/scgenerator/__init__.py
index 7276957..7eac434 100644
--- a/src/scgenerator/__init__.py
+++ b/src/scgenerator/__init__.py
@@ -5,7 +5,7 @@ from scgenerator import io, noise, operators, plotting
 from scgenerator.helpers import *
 from scgenerator.logger import get_logger
 from scgenerator.math import abs2, argclosest, normalized, span, tspace, wspace
-from scgenerator.parameter import Parameters
+from scgenerator.parameter import Parameters, format_value
 from scgenerator.spectra import Spectrum, propagation, propagation_series
 from scgenerator.physics import fiber, materials, plasma, pulse
 from scgenerator.physics.units import PlotRange
diff --git a/src/scgenerator/const.py b/src/scgenerator/const.py
index d16abed..d513b2c 100644
--- a/src/scgenerator/const.py
+++ b/src/scgenerator/const.py
@@ -27,7 +27,7 @@ SPEC1_FN_N = "spectrum_{}_{}.npy"
 Z_FN = "z.npy"
 PARAM_FN = "params.toml"
 PARAM_SEPARATOR = " "
-DECIMALS_DISPLAY = 6
+DECIMALS_DISPLAY = 4
 
 MANDATORY_PARAMETERS = {
     "name",
diff --git a/src/scgenerator/physics/units.py b/src/scgenerator/physics/units.py
index 44a8af0..cbf093b 100644
--- a/src/scgenerator/physics/units.py
+++ b/src/scgenerator/physics/units.py
@@ -5,7 +5,7 @@
 from __future__ import annotations
 
 from operator import itemgetter
-from typing import Callable, TypeVar, Union
+from typing import Callable, Sequence, TypeVar, Union
 
 import numpy as np
 from numpy import pi
@@ -124,7 +124,13 @@ def unit_formatter(
             prefix = "yzafpnµm kMGTPEZY"[8 + exp] if exp else ""
             return f"{float(base)*10**mult:.{decimals}g}{prefix}{unit}"
 
-    return formatter
+    def _format(val):
+        if isinstance(val, (Sequence, np.ndarray)):
+            return f"({', '.join(_format(el) for el in val)})"
+        else:
+            return formatter(val)
+
+    return _format
 
 
 class unit:
diff --git a/tests/test_variableparameters.py b/tests/test_variableparameters.py
index b95581e..42906ee 100644
--- a/tests/test_variableparameters.py
+++ b/tests/test_variableparameters.py
@@ -21,6 +21,10 @@ def test_debase():
 
 
 def test_get_sequence():
+    s = get_sequence([[0, 0, 20]])
+    assert len(s) == 20
+    assert all(el == 0 for el in s)
+
     s = get_sequence([1, 2, 3])
     assert isinstance(s, np.ndarray) and s.dtype == int
     assert np.all(s == np.array([1, 2, 3]))
@@ -41,6 +45,9 @@ def test_get_sequence():
     assert isinstance(s, np.ndarray) and s.dtype == int
     assert np.all(s == np.array([0]))
 
+    s = get_sequence(np.zeros((1, 2)))
+    assert s.shape == (1, 2)
+
     s = get_sequence([[1e-12, 1e-5, 8, "geometric"]])
     assert isinstance(s, np.ndarray) and s.dtype == float
     assert np.all(s == np.geomspace(1e-12, 1e-5, 8))
@@ -49,6 +56,10 @@ def test_get_sequence():
     assert isinstance(s, np.ndarray) and s.dtype == float
     assert np.all(s == np.concatenate(((0,), np.geomspace(1e-12, 1e-5, 8))))
 
+    s = get_sequence(np.arange(10).reshape(5, 2))
+    assert s[0][1] == 1
+    assert s[4][0] == 8
+
     with pytest.raises(ValueError):
         get_sequence([[1, 2, 3, "logarithm"]])
 
@@ -88,18 +99,21 @@ def test_constant_list():
     class Conf:
         x: Variable = vfield(default=[1, 2, 7])
         y: Variable = vfield(default=[2, 0])
+        z: Variable = vfield(default=np.arange(10).reshape(5, 2))
 
     conf = Conf()
-    assert len(conf) == 6
+    assert len(conf) == 3 * 2 * 5
     assert conf.x(0) == 1
     assert conf.y(0) == 2
     assert conf.x(len(conf) - 1) == 7
     assert conf.y(len(conf) - 1) == 0
+    assert list(conf.z(0)) == [0, 1]
+    assert list(conf.z(len(conf) - 1)) == [8, 9]
 
     with pytest.raises(ValueError):
-        conf.x(6)
+        conf.x(30)
     with pytest.raises(ValueError):
-        conf.y(6)
+        conf.y(30)
 
 
 def test_simple_synchronize():
@@ -254,6 +268,12 @@ def test_unit_forammter():
     assert fmt(0.000001235) == "0.00012%"
     assert fmt(0.000000001235) == "1.2e-07%"
 
+    fmt = unit_formatter("", 4)
+    assert fmt((4, 2)) == "(4, 2)"
+    assert fmt([4, 2]) == "(4, 2)"
+    assert fmt(np.array([4, 2])) == "(4, 2)"
+    assert fmt(np.zeros((2, 2, 2))) == "(((0, 0), (0, 0)), ((0, 0), (0, 0)))"
+
 
 def test_param_formatting():
     """formatting is always respected"""