diff --git a/lib/application.dart b/lib/application.dart
index 15eba3a..1311779 100644
--- a/lib/application.dart
+++ b/lib/application.dart
@@ -7,6 +7,7 @@ import 'package:lightmeter/platform_config.dart';
 import 'package:lightmeter/providers/user_preferences_provider.dart';
 import 'package:lightmeter/screens/metering/flow_metering.dart';
 import 'package:lightmeter/screens/settings/flow_settings.dart';
+import 'package:lightmeter/screens/timer/flow_timer.dart';
 
 class Application extends StatelessWidget {
   const Application({super.key});
@@ -38,10 +39,11 @@ class Application extends StatelessWidget {
           data: MediaQuery.of(context).copyWith(textScaleFactor: 1.0),
           child: child!,
         ),
-        initialRoute: "metering",
+        initialRoute: "timer",
         routes: {
           "metering": (context) => const MeteringFlow(),
           "settings": (context) => const SettingsFlow(),
+          "timer": (context) => const TimerFlow(),
         },
       ),
     );
diff --git a/lib/screens/shared/close_button/widget_button_close.dart b/lib/screens/shared/close_button/widget_button_close.dart
new file mode 100644
index 0000000..4d52678
--- /dev/null
+++ b/lib/screens/shared/close_button/widget_button_close.dart
@@ -0,0 +1,15 @@
+import 'package:flutter/material.dart';
+import 'package:lightmeter/generated/l10n.dart';
+
+class CloseButton extends StatelessWidget {
+  const CloseButton({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return IconButton(
+      onPressed: Navigator.of(context).pop,
+      icon: const Icon(Icons.close),
+      tooltip: S.of(context).tooltipClose,
+    );
+  }
+}
diff --git a/lib/screens/timer/bloc_timer.dart b/lib/screens/timer/bloc_timer.dart
new file mode 100644
index 0000000..753a7e7
--- /dev/null
+++ b/lib/screens/timer/bloc_timer.dart
@@ -0,0 +1,201 @@
+import 'dart:async';
+
+import 'package:bloc_concurrency/bloc_concurrency.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:lightmeter/data/models/volume_action.dart';
+import 'package:lightmeter/interactors/metering_interactor.dart';
+import 'package:lightmeter/screens/metering/communication/bloc_communication_metering.dart';
+import 'package:lightmeter/screens/metering/communication/event_communication_metering.dart'
+    as communication_events;
+import 'package:lightmeter/screens/metering/communication/state_communication_metering.dart'
+    as communication_states;
+import 'package:lightmeter/screens/metering/event_metering.dart';
+import 'package:lightmeter/screens/metering/state_metering.dart';
+import 'package:lightmeter/screens/metering/utils/notifier_volume_keys.dart';
+import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
+
+class MeteringBloc extends Bloc<MeteringEvent, MeteringState> {
+  final MeteringInteractor _meteringInteractor;
+  final VolumeKeysNotifier _volumeKeysNotifier;
+  final MeteringCommunicationBloc _communicationBloc;
+  late final StreamSubscription<communication_states.ScreenState> _communicationSubscription;
+
+  MeteringBloc(
+    this._meteringInteractor,
+    this._volumeKeysNotifier,
+    this._communicationBloc,
+  ) : super(
+          MeteringDataState(
+            ev100: null,
+            iso: _meteringInteractor.iso,
+            nd: _meteringInteractor.ndFilter,
+            isMetering: false,
+          ),
+        ) {
+    _volumeKeysNotifier.addListener(onVolumeKey);
+    _communicationSubscription = _communicationBloc.stream
+        .where((state) => state is communication_states.ScreenState)
+        .map((state) => state as communication_states.ScreenState)
+        .listen(onCommunicationState);
+
+    on<EquipmentProfileChangedEvent>(_onEquipmentProfileChanged);
+    on<IsoChangedEvent>(_onIsoChanged);
+    on<NdChangedEvent>(_onNdChanged);
+    on<MeasureEvent>(_onMeasure, transformer: droppable());
+    on<MeasuredEvent>(_onMeasured);
+    on<MeasureErrorEvent>(_onMeasureError);
+    on<SettingsOpenedEvent>(_onSettingsOpened);
+    on<SettingsClosedEvent>(_onSettingsClosed);
+  }
+
+  @override
+  void onTransition(Transition<MeteringEvent, MeteringState> transition) {
+    super.onTransition(transition);
+    if (transition.nextState is MeteringDataState) {
+      final nextState = transition.nextState as MeteringDataState;
+      if (transition.currentState is LoadingState ||
+          transition.currentState is MeteringDataState &&
+              (transition.currentState as MeteringDataState).ev != nextState.ev) {
+        if (nextState.hasError) {
+          _meteringInteractor.errorVibration();
+        } else {
+          _meteringInteractor.responseVibration();
+        }
+      }
+    }
+  }
+
+  @override
+  Future<void> close() async {
+    _volumeKeysNotifier.removeListener(onVolumeKey);
+    await _communicationSubscription.cancel();
+    return super.close();
+  }
+
+  @visibleForTesting
+  void onCommunicationState(communication_states.ScreenState communicationState) {
+    if (communicationState is communication_states.MeasuredState) {
+      _handleEv100(
+        communicationState.ev100,
+        isMetering: communicationState is communication_states.MeteringInProgressState,
+      );
+    }
+  }
+
+  void _onEquipmentProfileChanged(EquipmentProfileChangedEvent event, Emitter emit) {
+    bool willUpdateMeasurements = false;
+
+    /// Update selected ISO value and discard selected film, if selected equipment profile
+    /// doesn't contain currently selected value
+    IsoValue iso = state.iso;
+    if (!event.equipmentProfileData.isoValues.any((v) => state.iso.value == v.value)) {
+      _meteringInteractor.iso = event.equipmentProfileData.isoValues.first;
+      iso = event.equipmentProfileData.isoValues.first;
+      willUpdateMeasurements = true;
+    }
+
+    /// The same for ND filter
+    NdValue nd = state.nd;
+    if (!event.equipmentProfileData.ndValues.any((v) => state.nd.value == v.value)) {
+      _meteringInteractor.ndFilter = event.equipmentProfileData.ndValues.first;
+      nd = event.equipmentProfileData.ndValues.first;
+      willUpdateMeasurements = true;
+    }
+
+    if (willUpdateMeasurements) {
+      emit(
+        MeteringDataState(
+          ev100: state.ev100,
+          iso: iso,
+          nd: nd,
+          isMetering: state.isMetering,
+        ),
+      );
+    }
+  }
+
+  void _onIsoChanged(IsoChangedEvent event, Emitter emit) {
+    if (state.iso != event.isoValue) {
+      _meteringInteractor.iso = event.isoValue;
+      emit(
+        MeteringDataState(
+          ev100: state.ev100,
+          iso: event.isoValue,
+          nd: state.nd,
+          isMetering: state.isMetering,
+        ),
+      );
+    }
+  }
+
+  void _onNdChanged(NdChangedEvent event, Emitter emit) {
+    if (state.nd != event.ndValue) {
+      _meteringInteractor.ndFilter = event.ndValue;
+      emit(
+        MeteringDataState(
+          ev100: state.ev100,
+          iso: state.iso,
+          nd: event.ndValue,
+          isMetering: state.isMetering,
+        ),
+      );
+    }
+  }
+
+  void _onMeasure(MeasureEvent _, Emitter emit) {
+    _meteringInteractor.quickVibration();
+    _communicationBloc.add(const communication_events.MeasureEvent());
+    emit(
+      LoadingState(
+        iso: state.iso,
+        nd: state.nd,
+      ),
+    );
+  }
+
+  void _handleEv100(double? ev100, {required bool isMetering}) {
+    if (ev100 == null || ev100.isNaN || ev100.isInfinite) {
+      add(MeasureErrorEvent(isMetering: isMetering));
+    } else {
+      add(MeasuredEvent(ev100, isMetering: isMetering));
+    }
+  }
+
+  void _onMeasured(MeasuredEvent event, Emitter emit) {
+    emit(
+      MeteringDataState(
+        ev100: event.ev100,
+        iso: state.iso,
+        nd: state.nd,
+        isMetering: event.isMetering,
+      ),
+    );
+  }
+
+  void _onMeasureError(MeasureErrorEvent event, Emitter emit) {
+    emit(
+      MeteringDataState(
+        ev100: null,
+        iso: state.iso,
+        nd: state.nd,
+        isMetering: event.isMetering,
+      ),
+    );
+  }
+
+  @visibleForTesting
+  void onVolumeKey() {
+    if (_meteringInteractor.volumeAction == VolumeAction.shutter) {
+      add(const MeasureEvent());
+    }
+  }
+
+  void _onSettingsOpened(SettingsOpenedEvent _, Emitter __) {
+    _communicationBloc.add(const communication_events.SettingsOpenedEvent());
+  }
+
+  void _onSettingsClosed(SettingsClosedEvent _, Emitter __) {
+    _communicationBloc.add(const communication_events.SettingsClosedEvent());
+  }
+}
diff --git a/lib/screens/timer/event_timer.dart b/lib/screens/timer/event_timer.dart
new file mode 100644
index 0000000..0a39844
--- /dev/null
+++ b/lib/screens/timer/event_timer.dart
@@ -0,0 +1,48 @@
+import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
+
+sealed class MeteringEvent {
+  const MeteringEvent();
+}
+
+class EquipmentProfileChangedEvent extends MeteringEvent {
+  final EquipmentProfile equipmentProfileData;
+
+  const EquipmentProfileChangedEvent(this.equipmentProfileData);
+}
+
+class IsoChangedEvent extends MeteringEvent {
+  final IsoValue isoValue;
+
+  const IsoChangedEvent(this.isoValue);
+}
+
+class NdChangedEvent extends MeteringEvent {
+  final NdValue ndValue;
+
+  const NdChangedEvent(this.ndValue);
+}
+
+class MeasureEvent extends MeteringEvent {
+  const MeasureEvent();
+}
+
+class MeasuredEvent extends MeteringEvent {
+  final double ev100;
+  final bool isMetering;
+
+  const MeasuredEvent(this.ev100, {required this.isMetering});
+}
+
+class MeasureErrorEvent extends MeteringEvent {
+  final bool isMetering;
+
+  const MeasureErrorEvent({required this.isMetering});
+}
+
+class SettingsOpenedEvent extends MeteringEvent {
+  const SettingsOpenedEvent();
+}
+
+class SettingsClosedEvent extends MeteringEvent {
+  const SettingsClosedEvent();
+}
diff --git a/lib/screens/timer/flow_timer.dart b/lib/screens/timer/flow_timer.dart
new file mode 100644
index 0000000..ee2136f
--- /dev/null
+++ b/lib/screens/timer/flow_timer.dart
@@ -0,0 +1,57 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:lightmeter/interactors/metering_interactor.dart';
+import 'package:lightmeter/providers/services_provider.dart';
+import 'package:lightmeter/screens/metering/bloc_metering.dart';
+import 'package:lightmeter/screens/metering/communication/bloc_communication_metering.dart';
+import 'package:lightmeter/screens/metering/screen_metering.dart';
+import 'package:lightmeter/screens/metering/utils/notifier_volume_keys.dart';
+import 'package:lightmeter/screens/timer/screen_timer.dart';
+
+class TimerFlow extends StatelessWidget {
+  const TimerFlow({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MeteringInteractorProvider(
+      data: MeteringInteractor(
+        ServicesProvider.of(context).userPreferencesService,
+        ServicesProvider.of(context).caffeineService,
+        ServicesProvider.of(context).hapticsService,
+        ServicesProvider.of(context).permissionsService,
+        ServicesProvider.of(context).lightSensorService,
+        ServicesProvider.of(context).volumeEventsService,
+      )..initialize(),
+      child: MultiBlocProvider(
+        providers: [
+          BlocProvider(create: (_) => MeteringCommunicationBloc()),
+          BlocProvider(
+            create: (context) => MeteringBloc(
+              MeteringInteractorProvider.of(context),
+              VolumeKeysNotifier(ServicesProvider.of(context).volumeEventsService),
+              context.read<MeteringCommunicationBloc>(),
+            ),
+          ),
+        ],
+        child: const TimerScreen(),
+      ),
+    );
+  }
+}
+
+class MeteringInteractorProvider extends InheritedWidget {
+  final MeteringInteractor data;
+
+  const MeteringInteractorProvider({
+    required this.data,
+    required super.child,
+    super.key,
+  });
+
+  static MeteringInteractor of(BuildContext context) {
+    return context.findAncestorWidgetOfExactType<MeteringInteractorProvider>()!.data;
+  }
+
+  @override
+  bool updateShouldNotify(MeteringInteractorProvider oldWidget) => false;
+}
diff --git a/lib/screens/timer/screen_timer.dart b/lib/screens/timer/screen_timer.dart
new file mode 100644
index 0000000..5d203e5
--- /dev/null
+++ b/lib/screens/timer/screen_timer.dart
@@ -0,0 +1,211 @@
+import 'dart:math';
+
+import 'package:flutter/material.dart';
+import 'package:lightmeter/generated/l10n.dart';
+import 'package:lightmeter/res/dimens.dart';
+import 'package:material_color_utilities/material_color_utilities.dart';
+
+class TimerScreen extends StatelessWidget {
+  const TimerScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        automaticallyImplyLeading: false,
+        centerTitle: true,
+        elevation: 0,
+        title: Text(
+          'Test',
+          style: TextStyle(
+            color: Theme.of(context).colorScheme.onSurface,
+            fontSize: Dimens.grid24,
+          ),
+        ),
+        actions: [const CloseButton()],
+      ),
+      body: SafeArea(
+        child: Center(
+          child: Column(
+            mainAxisAlignment: MainAxisAlignment.center,
+            children: [
+              SizedBox.fromSize(
+                size: Size.square(MediaQuery.sizeOf(context).width - Dimens.paddingL * 4),
+                child: _Timer(
+                  remainingSeconds: 5,
+                  timerLength: 124,
+                ),
+              ),
+            ],
+          ),
+        ),
+      ),
+      floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
+      floatingActionButton: FloatingActionButton(
+        onPressed: () {},
+      ),
+    );
+  }
+}
+
+class _Timer extends StatelessWidget {
+  final int remainingSeconds;
+  final int timerLength;
+
+  const _Timer({
+    required this.remainingSeconds,
+    required this.timerLength,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return CustomPaint(
+      painter: _TimelinePainter(
+        backgroundColor: ElevationOverlay.applySurfaceTint(
+          Theme.of(context).cardTheme.color!,
+          Theme.of(context).cardTheme.surfaceTintColor,
+          Theme.of(context).cardTheme.elevation!,
+        ),
+        progressColor: Theme.of(context).colorScheme.primary,
+        progress: remainingSeconds / timerLength,
+      ),
+      willChange: true,
+      child: Center(
+        child: Text(
+          parseSeconds(),
+          style: Theme.of(context).textTheme.headlineLarge,
+        ),
+      ),
+    );
+  }
+
+  String parseSeconds() {
+    String addZeroIfNeeded(int value) {
+      if (value == 0) {
+        return '00';
+      } else if (value < 10) {
+        return '0$value';
+      } else {
+        return '$value';
+      }
+    }
+
+    final buffer = StringBuffer();
+    int remainingSeconds = this.remainingSeconds;
+    // longer than 1 hours
+    if (timerLength >= 3600) {
+      final hours = remainingSeconds ~/ 3600;
+      buffer.writeAll([addZeroIfNeeded(hours), ':']);
+      remainingSeconds -= hours * 3600;
+    }
+    // longer than 1 minute
+    if (timerLength >= 60 || timerLength == 0) {
+      final minutes = remainingSeconds ~/ 60;
+      buffer.writeAll([addZeroIfNeeded(minutes), ':']);
+      remainingSeconds -= minutes * 60;
+    }
+    // longer than 1 second
+    buffer.write(addZeroIfNeeded(remainingSeconds));
+    return buffer.toString();
+  }
+}
+
+class _TimelinePainter extends CustomPainter {
+  final Color progressColor;
+  final Color backgroundColor;
+  final double progress;
+
+  late final double timelineEdgeRadius = strokeWidth / 2;
+  late final double radiansProgress = 2 * pi * progress;
+  static const double radiansQuarterTurn = -pi / 2;
+  static const double strokeWidth = Dimens.grid8;
+
+  _TimelinePainter({
+    required this.progressColor,
+    required this.backgroundColor,
+    required this.progress,
+  });
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    final radius = size.height / 2;
+    final timerCenter = Offset(radius, radius);
+    final timelineSegmentPath = Path.combine(
+      PathOperation.difference,
+      Path()
+        ..arcTo(
+          Rect.fromCenter(
+            center: timerCenter,
+            height: size.height,
+            width: size.width,
+          ),
+          radiansQuarterTurn,
+          radiansProgress,
+          false,
+        )
+        ..lineTo(radius, radius)
+        ..lineTo(radius, 0),
+      Path()
+        ..addOval(
+          Rect.fromCircle(
+            center: timerCenter,
+            radius: radius - strokeWidth,
+          ),
+        ),
+    );
+
+    final smoothEdgesPath = Path.combine(
+      PathOperation.union,
+      Path()
+        ..addOval(
+          Rect.fromCircle(
+            center: Offset(radius, timelineEdgeRadius),
+            radius: timelineEdgeRadius,
+          ),
+        ),
+      Path()
+        ..addOval(
+          Rect.fromCircle(
+            center: Offset(
+              (radius - timelineEdgeRadius) * cos(radiansProgress + radiansQuarterTurn) + radius,
+              (radius - timelineEdgeRadius) * sin(radiansProgress + radiansQuarterTurn) + radius,
+            ),
+            radius: timelineEdgeRadius,
+          ),
+        ),
+    );
+
+    canvas.drawPath(
+      Path.combine(
+        PathOperation.difference,
+        Path()
+          ..addOval(
+            Rect.fromCircle(
+              center: timerCenter,
+              radius: radius,
+            ),
+          ),
+        Path()
+          ..addOval(
+            Rect.fromCircle(
+              center: timerCenter,
+              radius: radius - strokeWidth,
+            ),
+          ),
+      ),
+      Paint()..color = backgroundColor,
+    );
+
+    canvas.drawPath(
+      Path.combine(
+        PathOperation.union,
+        timelineSegmentPath,
+        smoothEdgesPath,
+      ),
+      Paint()..color = progressColor,
+    );
+  }
+
+  @override
+  bool shouldRepaint(_TimelinePainter oldDelegate) => oldDelegate.progress != progress;
+}
diff --git a/lib/screens/timer/state_timer.dart b/lib/screens/timer/state_timer.dart
new file mode 100644
index 0000000..74dc792
--- /dev/null
+++ b/lib/screens/timer/state_timer.dart
@@ -0,0 +1,36 @@
+import 'package:flutter/material.dart';
+import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
+
+@immutable
+abstract class MeteringState {
+  final double? ev100;
+  final IsoValue iso;
+  final NdValue nd;
+  final bool isMetering;
+
+  const MeteringState({
+    this.ev100,
+    required this.iso,
+    required this.nd,
+    required this.isMetering,
+  });
+}
+
+class LoadingState extends MeteringState {
+  const LoadingState({
+    required super.iso,
+    required super.nd,
+  }) : super(isMetering: true);
+}
+
+class MeteringDataState extends MeteringState {
+  const MeteringDataState({
+    required super.ev100,
+    required super.iso,
+    required super.nd,
+    required super.isMetering,
+  });
+
+  double? get ev => ev100 != null ? ev100! + log2(iso.value / 100) - nd.stopReduction : null;
+  bool get hasError => ev == null;
+}