diff --git a/artiq/gui/entries.py b/artiq/gui/entries.py
index 0581eda60..dc065e111 100644
--- a/artiq/gui/entries.py
+++ b/artiq/gui/entries.py
@@ -5,7 +5,6 @@ from PyQt5 import QtCore, QtGui, QtWidgets
 
 from artiq.gui.tools import LayoutWidget, disable_scroll_wheel
 from artiq.gui.scanwidget import ScanWidget
-from artiq.gui.scientific_spinbox import ScientificSpinBox
 
 
 logger = logging.getLogger(__name__)
@@ -158,7 +157,7 @@ class _RangeScan(LayoutWidget):
         disable_scroll_wheel(scanner)
         self.addWidget(scanner, 0, 0, -1, 1)
 
-        start = ScientificSpinBox()
+        start = QtWidgets.QDoubleSpinBox()
         start.setStyleSheet("QDoubleSpinBox {color:blue}")
         start.setMinimumSize(110, 0)
         start.setSizePolicy(QtWidgets.QSizePolicy(
@@ -172,7 +171,7 @@ class _RangeScan(LayoutWidget):
         disable_scroll_wheel(npoints)
         self.addWidget(npoints, 1, 1)
 
-        stop = ScientificSpinBox()
+        stop = QtWidgets.QDoubleSpinBox()
         stop.setStyleSheet("QDoubleSpinBox {color:red}")
         stop.setMinimumSize(110, 0)
         disable_scroll_wheel(stop)
diff --git a/artiq/gui/scientific_spinbox.py b/artiq/gui/scientific_spinbox.py
deleted file mode 100644
index 65cbba669..000000000
--- a/artiq/gui/scientific_spinbox.py
+++ /dev/null
@@ -1,71 +0,0 @@
-import re
-from PyQt5 import QtGui, QtWidgets
-
-# after
-# http://jdreaver.com/posts/2014-07-28-scientific-notation-spin-box-pyside.html
-
-
-_inf = float("inf")
-# Regular expression to find floats. Match groups are the whole string, the
-# whole coefficient, the decimal part of the coefficient, and the exponent
-# part.
-_float_re = re.compile(r"(([+-]?\d+(\.\d*)?|\.\d+)([eE][+-]?\d+)?)")
-
-
-def valid_float_string(string):
-    match = _float_re.search(string)
-    if match:
-        return match.groups()[0] == string
-    return False
-
-
-class FloatValidator(QtGui.QValidator):
-    def validate(self, string, position):
-        if valid_float_string(string):
-            return self.Acceptable, string, position
-        if string == "" or string[position-1] in "eE.-+":
-            return self.Intermediate, string, position
-        return self.Invalid, string, position
-
-    def fixup(self, text):
-        match = _float_re.search(text)
-        if match:
-            return match.groups()[0]
-        return ""
-
-
-class ScientificSpinBox(QtWidgets.QDoubleSpinBox):
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-        self.setMinimum(-_inf)
-        self.setMaximum(_inf)
-        self.validator = FloatValidator()
-        self.setDecimals(20)
-
-    def validate(self, text, position):
-        return self.validator.validate(text, position)
-
-    def fixup(self, text):
-        return self.validator.fixup(text)
-
-    def valueFromText(self, text):
-        return float(text)
-
-    def textFromValue(self, value):
-        return format_float(value)
-
-    def stepBy(self, steps):
-        text = self.cleanText()
-        groups = _float_re.search(text).groups()
-        decimal = float(groups[1])
-        decimal += steps
-        new_string = "{:g}".format(decimal) + (groups[3] if groups[3] else "")
-        self.lineEdit().setText(new_string)
-
-
-def format_float(value):
-    """Modified form of the 'g' format specifier."""
-    string = "{:g}".format(value)
-    string = string.replace("e+", "e")
-    string = re.sub("e(-?)0*(\d+)", r"e\1\2", string)
-    return string