diff --git a/src/scales/__tests__/saxon.ts b/src/scales/__tests__/saxon.ts
new file mode 100644
index 0000000..944ea95
--- /dev/null
+++ b/src/scales/__tests__/saxon.ts
@@ -0,0 +1,50 @@
+import { Saxon as SaxonScale } from '../../scales'
+
+describe('SAXON', () => {
+  describe('valid grade formats', () => {
+    let consoleWarnSpy
+
+    beforeEach(() => {
+      consoleWarnSpy = jest.spyOn(console, 'warn').mockImplementation()
+    })
+
+    afterEach(() => {
+      consoleWarnSpy.mockRestore()
+    })
+
+    test('should handle valid grade format "1"', () => {
+      const score = SaxonScale.getScore('1')
+      expect(console.warn).not.toHaveBeenCalled()
+      expect(score).not.toEqual(-1)
+    })
+  })
+
+  describe('isType', () => {
+    test('should return true for valid grade format "7a"', () => {
+      const isValid = SaxonScale.isType('7a')
+      expect(isValid).toBe(true)
+    })
+
+    test('should return true for valid grade format "1"', () => {
+      const isValid = SaxonScale.isType('1')
+      expect(isValid).toBe(true)
+    })
+
+    test('should return false for invalid grade format "V"', () => {
+      const isValid = SaxonScale.isType('V')
+      expect(isValid).toBe(false)
+    })
+
+    test('should return false for invalid grade format "8d"', () => {
+      const isValid = SaxonScale.isType('8d')
+      expect(isValid).toBe(false)
+    })
+  })
+
+  describe('getScore', () => {
+    test('should handle grade format with slash "7a/7b"', () => {
+      const score = SaxonScale.getScore('7a/7b')
+      expect(score).not.toEqual(-1)
+    })
+  })
+})
diff --git a/src/scales/saxon.ts b/src/scales/saxon.ts
index 400811d..f430abc 100644
--- a/src/scales/saxon.ts
+++ b/src/scales/saxon.ts
@@ -3,7 +3,7 @@ import routes from '../data/routes.json'
 import { Route } from '.'
 import { GradeBandTypes, routeScoreToBand } from '../GradeBands'
 
-const saxonGradeRegex = /^((([7-9]|1[0-3])([a-c]))|([1-6]))$/i
+const saxonGradeRegex = /^((([7-9]|1[0-3])([a-c]))|([1-6])|([7-9]|1[0-3])(([a-c])\/([7-9]|1[0-3])([a-c])))$/i
 // Saxon grading system, predominant in Central Europe (esp. Germany, Austria, Switzerland)
 // Supports 1 -> 13c, slash grades i.e. 7a/7b
 // Uses Arabic numerals with letters from a-c, e.g. "7a" , "7b", or "7c" (hardest)