diff --git a/packages/xod-client-electron/src/debugger/sendToSerialMiddleware.js b/packages/xod-client-electron/src/debugger/sendToSerialMiddleware.js
index af5a6be6f..3aac53f2d 100644
--- a/packages/xod-client-electron/src/debugger/sendToSerialMiddleware.js
+++ b/packages/xod-client-electron/src/debugger/sendToSerialMiddleware.js
@@ -17,10 +17,10 @@ export default ({ getState }) => next => action => {
     ipcRenderer.send(DEBUG_SERIAL_SEND, action.payload);
   }
 
-  if (
-    action.type === client.NODE_UPDATE_PROPERTY &&
-    client.isSerialDebugRunning(state)
-  ) {
+  const isTweakActionType =
+    action.type === client.NODE_UPDATE_PROPERTY ||
+    action.type === client.TWEAK_PULSE_SENT;
+  if (isTweakActionType && client.isSerialDebugRunning(state)) {
     const { id: nodeId, value, patchPath } = action.payload;
     const nodeType = R.compose(
       XP.getNodeType,
diff --git a/packages/xod-client/src/core/styles/components/Inspector.scss b/packages/xod-client/src/core/styles/components/Inspector.scss
index eb99212c9..c17d56c33 100644
--- a/packages/xod-client/src/core/styles/components/Inspector.scss
+++ b/packages/xod-client/src/core/styles/components/Inspector.scss
@@ -132,6 +132,12 @@
   }
 }
 
+.inspectorButton {
+  box-sizing: border-box;
+  line-height: 16px;
+  padding: 5px 4px;
+}
+
 .Widget {
   margin: 6px 0;
   overflow: hidden;
@@ -215,6 +221,7 @@
 
   .inspector-input-wrapper,
   .inspectorTextInput,
+  .inspectorButton,
   .inspectorSelectInput {
     float: right;
     width: 120px;
diff --git a/packages/xod-client/src/debugger/sendToSimulationSerialMiddleware.js b/packages/xod-client/src/debugger/sendToSimulationSerialMiddleware.js
index 4de8ad22f..7ccd33db0 100644
--- a/packages/xod-client/src/debugger/sendToSimulationSerialMiddleware.js
+++ b/packages/xod-client/src/debugger/sendToSimulationSerialMiddleware.js
@@ -10,12 +10,15 @@ import {
 import * as editorSelectors from '../editor/selectors';
 
 import { NODE_UPDATE_PROPERTY } from '../project/actionTypes';
+import { TWEAK_PULSE_SENT } from '../editor/actionTypes';
 
 export default ({ getState }) => next => action => {
   const state = getState();
   const result = next(action);
 
-  if (action.type === NODE_UPDATE_PROPERTY && isSimulationRunning(state)) {
+  const isTweakActionType =
+    action.type === NODE_UPDATE_PROPERTY || action.type === TWEAK_PULSE_SENT;
+  if (isTweakActionType && isSimulationRunning(state)) {
     const { id: nodeId, value, patchPath } = action.payload;
     const nodeType = R.compose(
       XP.getNodeType,
diff --git a/packages/xod-client/src/editor/actionTypes.js b/packages/xod-client/src/editor/actionTypes.js
index 6ab748816..86304bba4 100644
--- a/packages/xod-client/src/editor/actionTypes.js
+++ b/packages/xod-client/src/editor/actionTypes.js
@@ -62,3 +62,5 @@ export const SIMULATION_COMPILED = 'SIMULATION_COMPILED';
 export const SIMULATION_LAUNCHED = 'SIMULATION_LAUNCHED';
 export const SIMULATION_ABORT = 'SIMULATION_ABORT';
 export const SIMULATION_ERROR = 'SIMULATION_ERROR';
+
+export const TWEAK_PULSE_SENT = 'TWEAK_PULSE_SENT';
diff --git a/packages/xod-client/src/editor/actions.js b/packages/xod-client/src/editor/actions.js
index 144fbda79..6d5ee7a77 100644
--- a/packages/xod-client/src/editor/actions.js
+++ b/packages/xod-client/src/editor/actions.js
@@ -879,3 +879,15 @@ export const runSimulation = (simulationPatchPath, nodeIdsMap, code) => (
       });
     });
 };
+
+export const sendTweakPulse = tweakNodeId => (dispatch, getState) => {
+  Selectors.getCurrentPatchPath(getState()).map(patchPath =>
+    dispatch({
+      type: ActionType.TWEAK_PULSE_SENT,
+      payload: {
+        patchPath,
+        id: tweakNodeId,
+      },
+    })
+  );
+};
diff --git a/packages/xod-client/src/editor/components/Inspector.jsx b/packages/xod-client/src/editor/components/Inspector.jsx
index 27dd06564..027021c09 100644
--- a/packages/xod-client/src/editor/components/Inspector.jsx
+++ b/packages/xod-client/src/editor/components/Inspector.jsx
@@ -49,11 +49,19 @@ const renderSelectedComment = () => (
   <InspectorMessage text="Comments do not have any properties." />
 );
 const renderSelectedNode = R.curry(
-  (onPropUpdate, onNodeSpecializationChanged, selection) => (
+  (
+    onPropUpdate,
+    onNodeSpecializationChanged,
+    onSendTweakPulse,
+    isDebugSession,
+    selection
+  ) => (
     <NodeInspector
       node={selection[0].data}
       onPropUpdate={onPropUpdate}
       onNodeSpecializationChanged={onNodeSpecializationChanged}
+      onSendTweakPulse={onSendTweakPulse}
+      isDebugSession={isDebugSession}
     />
   )
 );
@@ -97,9 +105,11 @@ const Inspector = ({
   autohide,
   selection,
   currentPatch,
+  isDebugSession,
   onPropUpdate,
   onNodeSpecializationChanged,
   onPatchDescriptionUpdate,
+  onSendTweakPulse,
 }) => {
   const inspectorContent = R.cond([
     [isMany, renderSelectedManyElements],
@@ -107,7 +117,12 @@ const Inspector = ({
     [isSingleComment, renderSelectedComment],
     [
       isSingleNode,
-      renderSelectedNode(onPropUpdate, onNodeSpecializationChanged),
+      renderSelectedNode(
+        onPropUpdate,
+        onNodeSpecializationChanged,
+        onSendTweakPulse,
+        isDebugSession
+      ),
     ],
     [
       isPatchSelected(currentPatch),
@@ -134,9 +149,11 @@ Inspector.propTypes = {
   autohide: PropTypes.bool.isRequired,
   selection: sanctuaryPropType($.Array(RenderableSelection)),
   currentPatch: sanctuaryPropType($Maybe(Patch)),
+  isDebugSession: PropTypes.bool.isRequired,
   onPropUpdate: PropTypes.func.isRequired,
   onNodeSpecializationChanged: PropTypes.func.isRequired,
   onPatchDescriptionUpdate: PropTypes.func.isRequired,
+  onSendTweakPulse: PropTypes.func.isRequired,
 };
 
 Inspector.defaultProps = {
diff --git a/packages/xod-client/src/editor/components/NodeInspector.jsx b/packages/xod-client/src/editor/components/NodeInspector.jsx
index 6becf8e26..40881e2be 100644
--- a/packages/xod-client/src/editor/components/NodeInspector.jsx
+++ b/packages/xod-client/src/editor/components/NodeInspector.jsx
@@ -1,5 +1,6 @@
 import React from 'react';
 import PropTypes from 'prop-types';
+import R from 'ramda';
 import * as XP from 'xod-project';
 
 import { WIDGET_TYPE } from '../constants';
@@ -10,6 +11,7 @@ import {
   Widget,
   HintWidget,
   NodeSpecializationWidget,
+  PulseTweakWidget,
   getNodeWidgetConfig,
 } from './inspectorWidgets';
 
@@ -19,7 +21,19 @@ import { getUtmSiteUrl } from '../../utils/urls';
 
 import * as MESSAGES from '../messages';
 
-const NodeInspector = ({ node, onPropUpdate, onNodeSpecializationChanged }) => {
+const isTweakPulseNode = R.compose(
+  nodeType =>
+    XP.isTweakPath(nodeType) && XP.getTweakType(nodeType) === XP.PIN_TYPE.PULSE,
+  XP.getNodeType
+);
+
+const NodeInspector = ({
+  node,
+  isDebugSession,
+  onPropUpdate,
+  onNodeSpecializationChanged,
+  onSendTweakPulse,
+}) => {
   const type = XP.getNodeType(node);
   const baseName = XP.getBaseName(type);
   const nodeId = XP.getNodeId(node);
@@ -58,7 +72,16 @@ const NodeInspector = ({ node, onPropUpdate, onNodeSpecializationChanged }) => {
 
       {DeadNodeMessage}
 
-      <PinWidgetsGroup node={node} onPropUpdate={onPropUpdate} />
+      <ul>
+        {isDebugSession && isTweakPulseNode(node) ? (
+          <PulseTweakWidget
+            onSendTweakPulse={onSendTweakPulse}
+            nodeId={nodeId}
+          />
+        ) : (
+          <PinWidgetsGroup node={node} onPropUpdate={onPropUpdate} />
+        )}
+      </ul>
 
       <Widget
         {...getNodeWidgetConfig(WIDGET_TYPE.LABEL)}
@@ -90,6 +113,8 @@ NodeInspector.propTypes = {
   node: sanctuaryPropType(RenderableNode),
   onPropUpdate: PropTypes.func.isRequired,
   onNodeSpecializationChanged: PropTypes.func.isRequired,
+  isDebugSession: PropTypes.bool.isRequired,
+  onSendTweakPulse: PropTypes.func.isRequired,
 };
 
 export default NodeInspector;
diff --git a/packages/xod-client/src/editor/components/PinWidgetsGroup.jsx b/packages/xod-client/src/editor/components/PinWidgetsGroup.jsx
index c40e00923..41e540a0b 100644
--- a/packages/xod-client/src/editor/components/PinWidgetsGroup.jsx
+++ b/packages/xod-client/src/editor/components/PinWidgetsGroup.jsx
@@ -8,7 +8,7 @@ import { Widget, getNodeWidgetConfig } from './inspectorWidgets';
 
 const PinWidgetsGroup = ({ node, onPropUpdate }) =>
   R.compose(
-    widgets => <ul>{widgets}</ul>,
+    widgets => <React.Fragment>{widgets}</React.Fragment>,
     R.map(renderablePin => {
       const widgetProps = R.applySpec({
         entityId: R.prop('nodeId'),
diff --git a/packages/xod-client/src/editor/components/inspectorWidgets/PulseTweakWidget.jsx b/packages/xod-client/src/editor/components/inspectorWidgets/PulseTweakWidget.jsx
new file mode 100644
index 000000000..a0b1ccaf7
--- /dev/null
+++ b/packages/xod-client/src/editor/components/inspectorWidgets/PulseTweakWidget.jsx
@@ -0,0 +1,46 @@
+import React from 'react';
+import PT from 'prop-types';
+import * as XP from 'xod-project';
+
+import PinWidget from './pinWidgets/PinWidget';
+
+class PulseTweakWidget extends React.Component {
+  constructor(props) {
+    super(props);
+
+    this.handleClick = this.handleClick.bind(this);
+  }
+
+  handleClick() {
+    this.props.onSendTweakPulse(this.props.nodeId);
+  }
+
+  render() {
+    return (
+      <li>
+        <PinWidget
+          elementId="pulse-tweak"
+          label="OUT"
+          dataType={XP.PIN_TYPE.PULSE}
+          direction={XP.PIN_DIRECTION.OUTPUT}
+          isBindable
+          isConnected
+        >
+          <button
+            className="Button inspectorButton"
+            onClick={this.handleClick}
+          >
+            Pulse
+          </button>
+        </PinWidget>
+      </li>
+    );
+  }
+}
+
+PulseTweakWidget.propTypes = {
+  nodeId: PT.string.isRequired,
+  onSendTweakPulse: PT.func.isRequired,
+};
+
+export default PulseTweakWidget;
diff --git a/packages/xod-client/src/editor/components/inspectorWidgets/index.js b/packages/xod-client/src/editor/components/inspectorWidgets/index.js
index 24922c20c..2b950ee02 100644
--- a/packages/xod-client/src/editor/components/inspectorWidgets/index.js
+++ b/packages/xod-client/src/editor/components/inspectorWidgets/index.js
@@ -148,6 +148,7 @@ export {
 } from './pinWidgets/DisabledInputWidget';
 export { default as DescriptionWidget } from './DescriptionWidget';
 export { default as LabelWidget } from './LabelWidget';
+export { default as PulseTweakWidget } from './PulseTweakWidget';
 export {
   default as NodeSpecializationWidget,
 } from './NodeSpecializationWidget';
diff --git a/packages/xod-client/src/editor/components/inspectorWidgets/pinWidgets/PinWidget.jsx b/packages/xod-client/src/editor/components/inspectorWidgets/pinWidgets/PinWidget.jsx
index c8903b2a9..7274bb140 100644
--- a/packages/xod-client/src/editor/components/inspectorWidgets/pinWidgets/PinWidget.jsx
+++ b/packages/xod-client/src/editor/components/inspectorWidgets/pinWidgets/PinWidget.jsx
@@ -80,6 +80,7 @@ PinWidget.propTypes = {
 
 PinWidget.defaultProps = {
   children: null,
+  isLastVariadicGroup: false,
 };
 
 export default PinWidget;
diff --git a/packages/xod-client/src/editor/containers/Sidebar.jsx b/packages/xod-client/src/editor/containers/Sidebar.jsx
index a783d28c7..e52f45687 100644
--- a/packages/xod-client/src/editor/containers/Sidebar.jsx
+++ b/packages/xod-client/src/editor/containers/Sidebar.jsx
@@ -22,6 +22,7 @@ import * as EditorSelectors from '../selectors';
 import * as ProjectActions from '../../project/actions';
 import * as ProjectSelectors from '../../project/selectors';
 import * as UserSelectors from '../../user/selectors';
+import * as DebuggerSelectors from '../../debugger/selectors';
 import { RenderableSelection } from '../../types';
 import sanctuaryPropType from '../../utils/sanctuaryPropType';
 import { SIDEBAR_IDS, PANEL_IDS, FOCUS_AREAS } from '../constants';
@@ -147,6 +148,8 @@ class Sidebar extends React.Component {
             this.props.actions.changeNodeSpecialization
           }
           onPatchDescriptionUpdate={this.props.actions.updatePatchDescription}
+          onSendTweakPulse={this.props.actions.sendTweakPulse}
+          isDebugSession={this.props.isDebugSession}
         />
       </FocusTrap>
     );
@@ -237,6 +240,7 @@ Sidebar.propTypes = {
   windowSize: PropTypes.object.isRequired,
   selection: sanctuaryPropType($.Array(RenderableSelection)),
   currentPatch: sanctuaryPropType($Maybe(XP.Patch)),
+  isDebugSession: PropTypes.bool.isRequired,
   panels: PropTypes.objectOf(
     PropTypes.shape({
       /* eslint-disable react/no-unused-prop-types */
@@ -253,6 +257,7 @@ Sidebar.propTypes = {
     resizePanels: PropTypes.func.isRequired,
     togglePanel: PropTypes.func.isRequired,
     setFocusedArea: PropTypes.func.isRequired,
+    sendTweakPulse: PropTypes.func.isRequired,
   }),
   userAuthorised: PropTypes.bool.isRequired,
 };
@@ -262,6 +267,7 @@ const mapStateToProps = R.applySpec({
   currentPatch: ProjectSelectors.getCurrentPatch,
   panels: EditorSelectors.getAllPanelsSettings,
   userAuthorised: UserSelectors.isAuthorized,
+  isDebugSession: DebuggerSelectors.isDebugSession,
 });
 const mapDispatchToProps = dispatch => ({
   actions: bindActionCreators(
@@ -272,6 +278,7 @@ const mapDispatchToProps = dispatch => ({
       resizePanels: EditorActions.resizePanels,
       togglePanel: EditorActions.togglePanel,
       setFocusedArea: EditorActions.setFocusedArea,
+      sendTweakPulse: EditorActions.sendTweakPulse,
     },
     dispatch
   ),
diff --git a/packages/xod-client/src/index.js b/packages/xod-client/src/index.js
index b0eec5dd0..3a98a2a69 100644
--- a/packages/xod-client/src/index.js
+++ b/packages/xod-client/src/index.js
@@ -26,7 +26,11 @@ import {
 import { LOG_TAB_TYPE } from './debugger/constants';
 
 import { MESSAGE_BUTTON_CLICKED } from './messages/actionTypes';
-import { TAB_CLOSE, INSTALL_LIBRARIES_COMPLETE } from './editor/actionTypes';
+import {
+  TAB_CLOSE,
+  INSTALL_LIBRARIES_COMPLETE,
+  TWEAK_PULSE_SENT,
+} from './editor/actionTypes';
 import { SAVE_ALL, NODE_UPDATE_PROPERTY } from './project/actionTypes';
 
 import * as EditorConstants from './editor/constants';
@@ -84,7 +88,11 @@ export { LOG_TAB_TYPE } from './debugger/constants';
 
 export { MESSAGE_BUTTON_CLICKED } from './messages/actionTypes';
 export { TAB_CLOSE, INSTALL_LIBRARIES_COMPLETE } from './editor/actionTypes';
-export { SAVE_ALL, NODE_UPDATE_PROPERTY } from './project/actionTypes';
+export {
+  SAVE_ALL,
+  NODE_UPDATE_PROPERTY,
+  TWEAK_PULSE_SENT,
+} from './project/actionTypes';
 export {
   SERIAL_SESSION_STARTED,
   LINE_SENT_TO_SERIAL,
@@ -172,6 +180,7 @@ export default Object.assign(
     TAB_CLOSE,
     SAVE_ALL,
     NODE_UPDATE_PROPERTY,
+    TWEAK_PULSE_SENT,
     INSTALL_LIBRARIES_COMPLETE,
     MESSAGE_BUTTON_CLICKED,
     Messages: coreMessages,
diff --git a/packages/xod-client/src/project/components/nodeParts/ConstantNodeBody.jsx b/packages/xod-client/src/project/components/nodeParts/ConstantNodeBody.jsx
index af9b8e756..9448fbd06 100644
--- a/packages/xod-client/src/project/components/nodeParts/ConstantNodeBody.jsx
+++ b/packages/xod-client/src/project/components/nodeParts/ConstantNodeBody.jsx
@@ -7,7 +7,16 @@ import { noop } from 'xod-func-tools';
 import RegularNodeBody from './RegularNodeBody';
 
 export const getConstantValue = ({ pins }) =>
-  R.compose(R.prop('value'), R.head, R.values)(pins);
+  R.compose(
+    R.ifElse(
+      // because for pulse nodes value will always be 'Never'
+      R.pipe(XP.getPinType, R.equals(XP.PIN_TYPE.PULSE)),
+      R.always(null),
+      R.prop('value')
+    ),
+    R.head,
+    R.values
+  )(pins);
 
 const ConstantNodeBody = props => (
   <RegularNodeBody