diff --git a/CMakeLists.txt b/CMakeLists.txt
index fc51c14..43dd767 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -344,6 +344,7 @@ endif()
 ###------------------------------------------------------------------------------------------
 
 set(PUBLICHEADERS
+    include/aare/AngleCalibration.hpp
     include/aare/ArrayExpr.hpp
     include/aare/CalculateEta.hpp
     include/aare/Cluster.hpp
@@ -433,6 +434,7 @@ endif()
 if(AARE_TESTS)
     set(TestSources
             ${CMAKE_CURRENT_SOURCE_DIR}/src/algorithm.test.cpp
+            ${CMAKE_CURRENT_SOURCE_DIR}/src/AngleCalibration.test.cpp
             ${CMAKE_CURRENT_SOURCE_DIR}/src/defs.test.cpp
             ${CMAKE_CURRENT_SOURCE_DIR}/src/decode.test.cpp
             ${CMAKE_CURRENT_SOURCE_DIR}/src/Dtype.test.cpp
diff --git a/include/aare/AngleCalibration.hpp b/include/aare/AngleCalibration.hpp
new file mode 100644
index 0000000..a8007b1
--- /dev/null
+++ b/include/aare/AngleCalibration.hpp
@@ -0,0 +1,106 @@
+#include <cstdint>
+#include <fstream>
+#include <iostream>
+#include <math.h>
+#include <sstream>
+#include <string>
+#include <vector>
+
+// function check connected that reads from a file if modules are connected or
+// not - which module though?
+
+// function read flatfield store in ff_corr probably correlation field
+
+// class variables:
+
+namespace aare {
+
+// TODO: can i have a static struct, constexpr?
+struct MythenSpecifications {
+
+    static constexpr int32_t max_modules = 48;
+    static constexpr int32_t channels_per_module = 1280;
+    static constexpr double pitch =
+        0.05; // what is this pitch pitch is up e.g. rotation aroung y axis
+    static constexpr double ttmin = -180.0; // what is this the angle
+    static constexpr float ttmax = 180.0;
+    static constexpr float ttstep =
+        0.0036; // probably here to calculate bin size
+};
+
+// number_of_activated_modules
+// number_of_channles
+// number_of_dimension
+// is bad array keeping track of bad channels!!
+class AngleCalibration {
+
+  public:
+    AngleCalibration() {
+        centers.reserve(MythenSpecifications::max_modules);
+        conversions.reserve(MythenSpecifications::max_modules);
+        offsets.reserve(MythenSpecifications::max_modules);
+    }
+
+    void read_initial_calibration_from_file(const std::string &filename);
+
+  protected:
+    std::vector<double> centers;
+    std::vector<double> conversions;
+    std::vector<double> offsets;
+};
+
+// read hdf5 files - > do they store the histogram? what angles do they store?
+
+// TODO what kind of file does it need to support? - probably code a csv parser
+void AngleCalibration::read_initial_calibration_from_file(
+    const std::string &filename) {
+
+    std::string line;
+    uint32_t module_number{};
+
+    try {
+        std::ifstream file(filename, std::ios_base::in);
+        if (!file.good()) {
+            throw std::logic_error("file does not exist");
+        }
+
+        std::stringstream file_buffer;
+        file_buffer << file.rdbuf();
+
+        while (file_buffer >> line) {
+            if (line == "module") {
+                file_buffer >> line;
+                module_number = std::stoi(line);
+            }
+            if (line == "center") {
+                file_buffer >> line;
+                centers.insert(centers.begin() + module_number,
+                               std::stod(line));
+            }
+            if (line == "conversion") {
+                file_buffer >> line;
+                conversions.insert(conversions.begin() + module_number,
+                                   std::stod(line));
+            }
+            if (line == "offset") {
+                file_buffer >> line;
+                offsets.insert(offsets.begin() + module_number,
+                               std::stod(line));
+            }
+        }
+
+        file.close();
+    } catch (const std::exception &e) {
+        std::cerr << "Error: " << e.what()
+                  << std::endl; // TODO: replace with log
+    }
+
+    // angle_sign = signbit(conversion);
+    // signed_angles = std::abs(conversion);
+    // inverse_angles = 1./signed_angles
+    // store [centers, signed_conversions, offsets]
+    // dont know what conversion and offset is - dont know what calculations one
+    // does there the errors are actually not needed
+}
+
+} // namespace aare
\ No newline at end of file
diff --git a/src/AngleCalibration.test.cpp b/src/AngleCalibration.test.cpp
new file mode 100644
index 0000000..d103705
--- /dev/null
+++ b/src/AngleCalibration.test.cpp
@@ -0,0 +1,53 @@
+/************************************************
+ * @file AngleCalibration.test.cpp
+ * @short test case for reading ascii file
+ ***********************************************/
+
+#include "aare/AngleCalibration.hpp"
+
+#include <filesystem>
+
+#include <catch2/catch_all.hpp>
+#include <catch2/catch_test_macros.hpp>
+#include <catch2/matchers/catch_matchers_floating_point.hpp>
+
+class AngleCalibrationTestClass : public aare::AngleCalibration {
+
+  public:
+    AngleCalibrationTestClass() = default;
+    ~AngleCalibrationTestClass() = default;
+
+    std::vector<double> get_centers() { return centers; }
+
+    std::vector<double> get_conversions() { return conversions; }
+
+    std::vector<double> get_offsets() { return offsets; }
+};
+
+TEST_CASE("read initial angle calibration file",
+          "[.anglecalibration][.fileread]") {
+
+    AngleCalibrationTestClass anglecalibration;
+
+    std::string filename =
+        "/home/mazzol_a/Documents/mythen3tools/beamline/"
+        "TDATA/Angcal_2E_Feb2023_P29.off"; // TODO change path upload data
+
+    REQUIRE(std::filesystem::exists(filename));
+
+    anglecalibration.read_initial_calibration_from_file(filename);
+
+    auto centers = anglecalibration.get_centers();
+    auto conversions = anglecalibration.get_conversions();
+    auto offsets = anglecalibration.get_offsets();
+
+    std::cout.precision(17);
+
+    CHECK(centers.size() == 48);
+    CHECK(conversions.size() == 48);
+    CHECK(offsets.size() == 48);
+
+    CHECK(centers[9] == Catch::Approx(660.342326));
+    CHECK(offsets[47] == Catch::Approx(5.8053312));
+    CHECK(conversions[27] == Catch::Approx(-0.6581179125e-4));
+}
\ No newline at end of file