diff --git a/scratch.js b/scratch.js
new file mode 100644
index 0000000..c907b1e
--- /dev/null
+++ b/scratch.js
@@ -0,0 +1,16 @@
+import fs from 'fs';
+import { validateCertificateAgainstStandard } from './services/validationEngine.js'; // Need to mock or transpile
+
+const std = JSON.parse(fs.readFileSync('./data/standards.json', 'utf8'))[0];
+const report = {
+  identification: { product: "PERFIL I" },
+  compliance: {
+    mechanical: [
+      { property: "Yield Strength (Limite de Escoamento)", certificate: "415 MPa", status: "OK" },
+      { property: "Tensile Strength", certificate: "547 MPa", status: "OK" }
+    ],
+    chemical: []
+  }
+};
+
+// We can't import typescript directly in node easily without tsx or ts-node.
diff --git a/scratch.ts b/scratch.ts
new file mode 100644
index 0000000..ff2104d
--- /dev/null
+++ b/scratch.ts
@@ -0,0 +1,17 @@
+import fs from 'fs';
+import { validateCertificateAgainstStandard } from './services/validationEngine';
+
+const std = JSON.parse(fs.readFileSync('./data/standards.json', 'utf8'))[0];
+const report: any = {
+  identification: { product: "PERFIL I", standards: "ASTM A572 GR50" },
+  compliance: {
+    mechanical: [
+      { property: "Yield Strength (Limite de Escoamento)", certificate: "415 MPa", status: "OK" },
+      { property: "Tensile Strength (Limite de Resistência)", certificate: "547 MPa", status: "OK" }
+    ],
+    chemical: []
+  }
+};
+
+const result = validateCertificateAgainstStandard(report, std);
+console.log(JSON.stringify(result.compliance.mechanical, null, 2));
diff --git a/services/validationEngine.ts b/services/validationEngine.ts
index dbe9916..74f4d47 100644
--- a/services/validationEngine.ts
+++ b/services/validationEngine.ts
@@ -198,19 +198,29 @@ export function validateCertificateAgainstStandard(extractedReport: ReportData,
         let status: 'OK' | 'FALHA' = 'OK';
         let normStr = [];
         
-        if (minLimit !== null) {
+        if (minLimit !== null && maxLimit !== null) {
+          normStr.push(`Min: ${minLimit} - Max: ${maxLimit}`);
+          if (val < minLimit) {
+             status = 'FALHA';
+             item.differencePercentage = `${(((val - minLimit) / minLimit) * 100).toFixed(1)}%`;
+          } else if (val > maxLimit) {
+             status = 'FALHA';
+             item.differencePercentage = `+${(((val - maxLimit) / maxLimit) * 100).toFixed(1)}%`;
+          } else {
+             item.differencePercentage = `+${(((val - minLimit) / minLimit) * 100).toFixed(1)}%`;
+          }
+        } else if (minLimit !== null) {
           normStr.push(`Min: ${minLimit}`);
           if (val < minLimit) status = 'FALHA';
           item.differencePercentage = `${val >= minLimit ? '+' : ''}${(((val - minLimit) / minLimit) * 100).toFixed(1)}%`;
-        }
-        
-        if (maxLimit !== null) {
+        } else if (maxLimit !== null) {
           normStr.push(`Max: ${maxLimit}`);
           if (val > maxLimit) status = 'FALHA';
+          item.differencePercentage = `${val <= maxLimit ? '-' : '+'}${Math.abs(((val - maxLimit) / maxLimit) * 100).toFixed(1)}%`;
         }
         
         if (normStr.length > 0) {
-          item.norm = normStr.join(' - ');
+          item.norm = normStr.join(' | ');
         } else {
           item.norm = '-';
         }
diff --git a/vite.config.ts b/vite.config.ts
index ee5fb8d..65860a2 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -8,6 +8,9 @@ export default defineConfig(({ mode }) => {
       server: {
         port: 3000,
         host: '0.0.0.0',
+        proxy: {
+          '/api': 'http://localhost:8081'
+        }
       },
       plugins: [react()],
       define: {