diff --git a/ApiCore-Backend/src/label-templates/label-templates.service.spec.ts b/ApiCore-Backend/src/label-templates/label-templates.service.spec.ts
index f19ae51..4499f02 100644
--- a/ApiCore-Backend/src/label-templates/label-templates.service.spec.ts
+++ b/ApiCore-Backend/src/label-templates/label-templates.service.spec.ts
@@ -1,5 +1,8 @@
 import { NotFoundException } from '@nestjs/common';
-import { LabelTemplatesService } from './label-templates.service';
+import {
+  LabelTemplatesService,
+  buildPlaceholderValues,
+} from './label-templates.service';
 import { PrismaService } from '../prisma/prisma.service';
 import { AuditLogService } from '../audit/audit-log.service';
 import { LabelElement } from './label-element.types';
@@ -415,4 +418,36 @@ describe('LabelTemplatesService', () => {
       expect(countPages(pdf)).toBe(2);
     });
   });
+
+  describe('buildPlaceholderValues', () => {
+    const bottlingBatch = {
+      jarSize: 500,
+      lotNumber: 'L-001',
+      date: new Date('2026-06-01T00:00:00.000Z'),
+      bestBeforeDate: new Date('2028-06-01T00:00:00.000Z'),
+      honeyBatch: { batchNumber: 'HB-001', honeyType: 'Bluetenhonig' },
+      product: { name: 'Glas 500g' },
+    };
+
+    it('prints the jar size in grams, the unit honey is sold by', () => {
+      expect(buildPlaceholderValues(bottlingBatch).jarSize).toBe('500 g');
+    });
+
+    it('never labels the jar size as a volume', () => {
+      expect(buildPlaceholderValues(bottlingBatch).jarSize).not.toMatch(
+        /\b(ml|l|cl)\b/,
+      );
+    });
+
+    it('leaves an unset honey type and product as empty text, not "null"', () => {
+      const values = buildPlaceholderValues({
+        ...bottlingBatch,
+        honeyBatch: { batchNumber: 'HB-001', honeyType: null },
+        product: null,
+      });
+
+      expect(values.honeyType).toBe('');
+      expect(values.productName).toBe('');
+    });
+  });
 });
diff --git a/ApiCore-Backend/src/label-templates/label-templates.service.ts b/ApiCore-Backend/src/label-templates/label-templates.service.ts
index f371efa..1509449 100644
--- a/ApiCore-Backend/src/label-templates/label-templates.service.ts
+++ b/ApiCore-Backend/src/label-templates/label-templates.service.ts
@@ -104,6 +104,34 @@ function dataUrlToBuffer(dataUrl: string): Buffer | null {
   return matchesFileSignature(buffer, mimeType) ? buffer : null;
 }
 
+/**
+ * The text every placeholder resolves to on a printed label.
+ *
+ * Extracted from the render path so the wording is unit-testable: the render
+ * output is a PDF buffer whose text is not readable by a test, which is how
+ * the jar size once shipped printed as "500 ml". jarSize is a fill weight in
+ * grams everywhere else in the app, and honey is a food sold by mass, so a
+ * label stating millilitres declares the wrong net quantity.
+ */
+export function buildPlaceholderValues(bottlingBatch: {
+  jarSize: number;
+  lotNumber: string;
+  date: Date;
+  bestBeforeDate: Date;
+  honeyBatch: { batchNumber: string; honeyType: string | null };
+  product: { name: string } | null;
+}): Record<PlaceholderKey, string> {
+  return {
+    batchNumber: bottlingBatch.honeyBatch.batchNumber,
+    honeyType: bottlingBatch.honeyBatch.honeyType ?? '',
+    lotNumber: bottlingBatch.lotNumber,
+    bottlingDate: formatDate(bottlingBatch.date),
+    bestBeforeDate: formatDate(bottlingBatch.bestBeforeDate),
+    jarSize: `${bottlingBatch.jarSize} g`,
+    productName: bottlingBatch.product?.name ?? '',
+  };
+}
+
 @Injectable()
 export class LabelTemplatesService {
   constructor(
@@ -210,15 +238,7 @@ export class LabelTemplatesService {
       throw new NotFoundException('Bottling batch not found');
     }
 
-    const values: Record<PlaceholderKey, string> = {
-      batchNumber: bottlingBatch.honeyBatch.batchNumber,
-      honeyType: bottlingBatch.honeyBatch.honeyType ?? '',
-      lotNumber: bottlingBatch.lotNumber,
-      bottlingDate: formatDate(bottlingBatch.date),
-      bestBeforeDate: formatDate(bottlingBatch.bestBeforeDate),
-      jarSize: `${bottlingBatch.jarSize} ml`,
-      productName: bottlingBatch.product?.name ?? '',
-    };
+    const values = buildPlaceholderValues(bottlingBatch);
 
     const elements = elementsOf(template).map((element) =>
       element.type === 'text' && element.placeholderKey