diff --git a/test/form/CMakeLists.txt b/test/form/CMakeLists.txt
index 252817701..65f6e36ed 100644
--- a/test/form/CMakeLists.txt
+++ b/test/form/CMakeLists.txt
@@ -12,6 +12,7 @@ if(FORM_USE_ROOT_STORAGE)
       form_test_data_products
       TEST_ARGS
       "${CMAKE_CURRENT_BINARY_DIR}/toy.root"
+      "${CMAKE_CURRENT_BINARY_DIR}/toy_checksums.txt"
   )
   target_include_directories(WriteVector PRIVATE ${PROJECT_SOURCE_DIR}/form)
 
@@ -24,6 +25,7 @@ if(FORM_USE_ROOT_STORAGE)
       form_test_data_products
       TEST_ARGS
       "${CMAKE_CURRENT_BINARY_DIR}/toy.root"
+      "${CMAKE_CURRENT_BINARY_DIR}/toy_checksums.txt"
       TEST_PROPERTIES
       DEPENDS
       WriteVector
diff --git a/test/form/reader.cpp b/test/form/reader.cpp
index e27569bad..8d424732d 100644
--- a/test/form/reader.cpp
+++ b/test/form/reader.cpp
@@ -5,7 +5,10 @@
 #include "form/technology.hpp"
 #include "test_helpers.hpp"
 
-#include <iostream>
+#include <cmath>
+#include <fstream>
+#include <map>
+#include <sstream>
 #include <vector>
 
 static int const NUMBER_EVENT = 4;
@@ -13,12 +16,53 @@ static int const NUMBER_SEGMENT = 15;
 
 static char const* const evt_id = "[EVENT=%08X]";
 static char const* const seg_id = "[EVENT=%08X;SEG=%08X]";
+static float const TOLERANCE = 1e-3f;
+
+// Structs to hold expected checksums
+struct SegChecksum {
+  float check;
+  float cpx, cpy, cpz;
+};
+
+struct EvtChecksum {
+  float check;
+};
 
 int main(int argc, char** argv)
 {
   std::cout << "In main" << std::endl;
 
   std::string const filename = (argc > 1) ? argv[1] : "toy.root";
+  std::string const checksum_filename = (argc > 2) ? argv[2] : "toy_checksums.txt";
+
+  // Load expected checksums from file
+  std::map<std::pair<int, int>, SegChecksum> expected_seg;
+  std::map<int, EvtChecksum> expected_evt;
+
+  std::ifstream checksum_file(checksum_filename);
+  if (!checksum_file.is_open()) {
+    std::cerr << "ERROR: Could not open checksum file: " << checksum_filename << std::endl;
+    return 1;
+  }
+
+  std::string line;
+  while (std::getline(checksum_file, line)) {
+    std::istringstream iss(line);
+    std::string type;
+    iss >> type;
+    if (type == "SEG") {
+      int nevent, nseg;
+      SegChecksum cs;
+      iss >> nevent >> nseg >> cs.check >> cs.cpx >> cs.cpy >> cs.cpz;
+      expected_seg[{nevent, nseg}] = cs;
+    } else if (type == "EVT") {
+      int nevent;
+      EvtChecksum cs;
+      iss >> nevent >> cs.check;
+      expected_evt[nevent] = cs;
+    }
+  }
+  checksum_file.close();
 
   // TODO: Read configuration from config file instead of hardcoding
   form::experimental::config::output_item_config output_config;
@@ -31,6 +75,8 @@ int main(int argc, char** argv)
 
   form::experimental::form_interface form(output_config, tech_config);
 
+  bool all_passed = true;
+
   for (int nevent = 0; nevent < NUMBER_EVENT; nevent++) {
     std::cout << "PHLEX: Read Event No. " << nevent << std::endl;
 
@@ -82,6 +128,30 @@ int main(int argc, char** argv)
       std::cout << "PHLEX: Segment = " << nseg << ": seg_id_text = " << seg_id_text
                 << ", checkPoints = " << checkPoints << std::endl;
 
+      // Verify segment checksums
+      auto key = std::make_pair(nevent, nseg);
+      if (expected_seg.count(key)) {
+        auto const& exp = expected_seg[key];
+        bool seg_ok = (std::fabs(check - exp.check) <= TOLERANCE) &&
+                      (std::fabs(checkPoints.getX() - exp.cpx) <= TOLERANCE) &&
+                      (std::fabs(checkPoints.getY() - exp.cpy) <= TOLERANCE) &&
+                      (std::fabs(checkPoints.getZ() - exp.cpz) <= TOLERANCE);
+        if (seg_ok) {
+          std::cout << "VERIFY PASS: event=" << nevent << " seg=" << nseg << std::endl;
+        } else {
+          std::cerr << "VERIFY FAIL: event=" << nevent << " seg=" << nseg
+                    << " expected check=" << exp.check << " got=" << check
+                    << " expected cpx=" << exp.cpx << " got=" << checkPoints.getX()
+                    << " expected cpy=" << exp.cpy << " got=" << checkPoints.getY()
+                    << " expected cpz=" << exp.cpz << " got=" << checkPoints.getZ() << std::endl;
+          all_passed = false;
+        }
+      } else {
+        std::cerr << "VERIFY FAIL: no expected checksum for event=" << nevent << " seg=" << nseg
+                  << std::endl;
+        all_passed = false;
+      }
+
       delete track_start_x;
       delete track_n_hits;
       delete start_points;
@@ -106,11 +176,34 @@ int main(int argc, char** argv)
       check += val;
     std::cout << "PHLEX: Event = " << nevent << ": evt_id_text = " << evt_id_text
               << ", check = " << check << std::endl;
+
+    // Verify event checksum
+    if (expected_evt.count(nevent)) {
+      auto const& exp = expected_evt[nevent];
+      bool evt_ok = (std::fabs(check - exp.check) <= TOLERANCE);
+      if (evt_ok) {
+        std::cout << "VERIFY PASS: event=" << nevent << std::endl;
+      } else {
+        std::cerr << "VERIFY FAIL: event=" << nevent << " expected check=" << exp.check
+                  << " got=" << check << std::endl;
+        all_passed = false;
+      }
+    } else {
+      std::cerr << "VERIFY FAIL: no expected checksum for event=" << nevent << std::endl;
+      all_passed = false;
+    }
+
     delete track_x; //FIXME: PHLEX owns this memory!
 
     std::cout << "PHLEX: Read Event done " << nevent << std::endl;
   }
 
-  std::cout << "PHLEX: Read done " << std::endl;
-  return 0;
+  // Report overall result
+  if (all_passed) {
+    std::cout << "PHLEX: All verification checks PASSED." << std::endl;
+    return 0;
+  } else {
+    std::cerr << "PHLEX: Some verification checks FAILED." << std::endl;
+    return 1;
+  }
 }
diff --git a/test/form/writer.cpp b/test/form/writer.cpp
index 91a74fefc..454622231 100644
--- a/test/form/writer.cpp
+++ b/test/form/writer.cpp
@@ -7,6 +7,8 @@
 #include "toy_tracker.hpp"
 
 #include <cstdlib>
+#include <fstream>
+#include <iomanip>
 #include <iostream>
 #include <vector>
 
@@ -35,6 +37,7 @@ int main(int argc, char** argv)
   srand(time(0));
 
   std::string const filename = (argc > 1) ? argv[1] : "toy.root";
+  std::string const checksum_filename = (argc > 2) ? argv[2] : "toy_checksums.txt";
 
   // TODO: Read configuration from config file instead of hardcoding
   form::experimental::config::output_item_config output_config;
@@ -55,6 +58,13 @@ int main(int argc, char** argv)
 
   ToyTracker tracker(4 * 1024);
 
+  // Open checksum file for writing
+  std::ofstream checksum_file(checksum_filename);
+  if (!checksum_file.is_open()) {
+    std::cerr << "ERROR: Could not open checksum file: " << checksum_filename << std::endl;
+    return 1;
+  }
+
   for (int nevent = 0; nevent < NUMBER_EVENT; nevent++) {
     std::cout << "PHLEX: Write Event No. " << nevent << std::endl;
 
@@ -106,6 +116,10 @@ int main(int argc, char** argv)
 
       form.write(creator, segment_id, products);
 
+      // Save segment checksums
+      checksum_file << std::setprecision(10) << "SEG " << nevent << " " << nseg << " " << check
+                    << " " << checkPoints.getX() << " " << checkPoints.getY() << " "
+                    << checkPoints.getZ() << "\n";
       track_x.insert(track_x.end(), track_start_x.begin(), track_start_x.end());
     }
 
@@ -129,9 +143,12 @@ int main(int argc, char** argv)
 
     form.write(creator, event_id, pb);
 
+    // Save event checksum
+    checksum_file << std::setprecision(10) << "EVT " << nevent << " " << check << "\n";
     std::cout << "PHLEX: Write Event done " << nevent << std::endl;
   }
 
-  std::cout << "PHLEX: Write done " << std::endl;
+  checksum_file.close();
+  std::cout << "PHLEX: Write done. Checksums saved to " << checksum_filename << std::endl;
   return 0;
 }